Made a card game with 600 units per pallet, can I ship that pallet to Amazon Warehouse for that fulfillment without unpacking each unit and putting on a bar code?

We have a bunch of pallets in our warehouse and would like to ship off 3 pallets worth of items to Amazon for sales, but going through Seller’s University it says we have to label each individual package. We have a GTIN/UPC barcode label on each box. Does that mean I have to hire labor to unbox, get each unit out of the bubble wrap and add a upc code to each unit to be sold?