UPC barcode placement and shrink wrap

My factory is asking if I want to place my UPC barcode sticker on the box itself or on top of the shrink wrap that is around the gift box. I’m worried that if I placed the sticker on the shrink wrap, there will be no barcode on the product anymore when someone returns it to Amazon.

Should I place 2 stickers? the barcode on the product itself and another one on top of the shrink wrap.

or just place one sticker on the product itself? And hope it scans through the shrink wrap

Any advice would be helpful.

Also, this is a textile item and I am curious if I need to put the wash and care instructions on the outside of the package or if I’m OK with using the current product insert card that I have inside of it telling user how to clean it