Step 1: Acquire an EMC Condenser, as many AEGU of your choice, A Shulker box, and any items you want to dupe (This does extend to items without EMC too).
Step 2: Fill the Shulker with your desired items
Step 3: Place the Shulker in the target slot.
Step 4: Retrieve the newly generated Shulker boxes with exact copies of it's NBT data.
Found a dupe glitch involving the Condenser.
Step 1: Acquire an EMC Condenser, as many AEGU of your choice, A Shulker box, and any items you want to dupe (This does extend to items without EMC too). Step 2: Fill the Shulker with your desired items Step 3: Place the Shulker in the target slot. Step 4: Retrieve the newly generated Shulker boxes with exact copies of it's NBT data.