Amazon will give you barcodes to put on them. Print them, sticker them. Doesn't take long. Costs more if you make Amazon do it. The barcodes uniquely identify t

Amazon will give you barcodes to put on them. Print them, sticker them. Doesn't take long. Costs more if you make Amazon do it. The barcodes uniquely identify the item as yours, and not someone else's or Amazon's.