diff --git a/src/main/java/lol/hyper/toolstats/ToolStats.java b/src/main/java/lol/hyper/toolstats/ToolStats.java
index face1b8..010cd0c 100644
--- a/src/main/java/lol/hyper/toolstats/ToolStats.java
+++ b/src/main/java/lol/hyper/toolstats/ToolStats.java
@@ -103,6 +103,8 @@ public final class ToolStats extends JavaPlugin {
     public VillagerTrade villagerTrade;
     public CommandToolStats commandToolStats;
     public ItemLore itemLore;
+    public InventoryOpen inventoryOpen;
+    public NumberFormat numberFormat;
 
     public final Logger logger = this.getLogger();
     public final File configFile = new File(this.getDataFolder(), "config.yml");
@@ -111,7 +113,6 @@ public final class ToolStats extends JavaPlugin {
 
     private BukkitAudiences adventure;
 
-    public NumberFormat numberFormat;
 
     @Override
     public void onEnable() {
@@ -134,6 +135,7 @@ public final class ToolStats extends JavaPlugin {
         villagerTrade = new VillagerTrade(this);
         commandToolStats = new CommandToolStats(this);
         itemLore = new ItemLore(this);
+        inventoryOpen = new InventoryOpen(this);
 
         Bukkit.getServer().getPluginManager().registerEvents(blocksMined, this);
         Bukkit.getServer().getPluginManager().registerEvents(chunkPopulate, this);
@@ -146,6 +148,7 @@ public final class ToolStats extends JavaPlugin {
         Bukkit.getServer().getPluginManager().registerEvents(playerInteract, this);
         Bukkit.getServer().getPluginManager().registerEvents(sheepShear, this);
         Bukkit.getServer().getPluginManager().registerEvents(villagerTrade, this);
+        Bukkit.getServer().getPluginManager().registerEvents(inventoryOpen, this);
 
         this.getCommand("toolstats").setExecutor(commandToolStats);
 
diff --git a/src/main/java/lol/hyper/toolstats/events/InventoryOpen.java b/src/main/java/lol/hyper/toolstats/events/InventoryOpen.java
new file mode 100644
index 0000000..c03f9e2
--- /dev/null
+++ b/src/main/java/lol/hyper/toolstats/events/InventoryOpen.java
@@ -0,0 +1,136 @@
+/*
+ * This file is part of ToolStats.
+ *
+ * ToolStats is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ToolStats is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with ToolStats.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package lol.hyper.toolstats.events;
+
+import lol.hyper.toolstats.ToolStats;
+import lol.hyper.toolstats.tools.ItemChecker;
+import org.bukkit.Bukkit;
+import org.bukkit.Material;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.inventory.InventoryOpenEvent;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.ItemMeta;
+import org.bukkit.persistence.PersistentDataContainer;
+import org.bukkit.persistence.PersistentDataType;
+
+import java.util.List;
+
+public class InventoryOpen implements Listener {
+
+    private final ToolStats toolStats;
+
+    public InventoryOpen(ToolStats toolStats) {
+        this.toolStats = toolStats;
+    }
+
+    @EventHandler
+    public void onOpen(InventoryOpenEvent event) {
+        if (event.isCancelled()) {
+            return;
+        }
+
+        Bukkit.getScheduler().runTaskLater(toolStats, ()-> {
+            Inventory inventory = event.getInventory();
+            for (ItemStack itemStack : inventory) {
+                if (itemStack == null) {
+                    continue;
+                }
+                ItemMeta itemMeta = itemStack.getItemMeta();
+                if (itemMeta == null) {
+                    continue;
+                }
+                PersistentDataContainer container = itemMeta.getPersistentDataContainer();
+                // ignore any items that already have the origin tag
+                if (container.has(toolStats.originType, PersistentDataType.INTEGER)) {
+                    continue;
+                }
+                // ignore items that are not the right type
+                if (!ItemChecker.isValidItem(itemStack.getType())) {
+                    continue;
+                }
+
+                ItemMeta newMeta = getOrigin(itemMeta, itemStack.getType() == Material.ELYTRA);
+                if (newMeta == null) {
+                    continue;
+                }
+                itemStack.setItemMeta(newMeta);
+            }
+        },1);
+    }
+
+    /**
+     * Determine an item's origin based on lore.
+     *
+     * @param itemMeta The item's meta.
+     * @param elytra   If they item is an elytra.
+     * @return The new item meta with the new origin tag. Returns null if origin cannot be determined.
+     */
+    private ItemMeta getOrigin(ItemMeta itemMeta, boolean elytra) {
+        List<String> lore;
+        if (!itemMeta.hasLore()) {
+            return null;
+        }
+        lore = itemMeta.getLore();
+        Integer origin = null;
+
+        for (String line : lore) {
+            // this is the worst code I have ever written
+            String createdBy = toolStats.getLoreFromConfig("created.created-by", false);
+            String createdOn = toolStats.getLoreFromConfig("created.created-by", false);
+            String caughtBy = toolStats.getLoreFromConfig("created.created-by", false);
+            String lootedBy = toolStats.getLoreFromConfig("created.created-by", false);
+            String foundBy = toolStats.getLoreFromConfig("created.created-by", false);
+            String tradedBy = toolStats.getLoreFromConfig("created.created-by", false);
+
+            if (createdBy != null && line.contains(createdBy)) {
+                origin = 0;
+            }
+            if (createdOn != null && line.contains(createdOn)) {
+                origin = 0;
+            }
+            if (caughtBy != null && line.contains(caughtBy)) {
+                origin = 5;
+            }
+            if (lootedBy != null && line.contains(lootedBy)) {
+                origin = 2;
+            }
+            // because the config changed, "found-by" was being used for ALL looted items
+            // this includes elytras, so we have to check for this mistake
+            if (foundBy != null && line.contains(foundBy)) {
+                if (elytra) {
+                    origin = 4;
+                } else {
+                    origin = 5;
+                }
+            }
+            if (tradedBy != null && line.contains(tradedBy)) {
+                origin = 3;
+            }
+        }
+
+        if (origin == null) {
+            return null;
+        }
+
+        PersistentDataContainer container = itemMeta.getPersistentDataContainer();
+        container.set(toolStats.originType, PersistentDataType.INTEGER, origin);
+        return itemMeta;
+    }
+}