Shipping product in retail boxes directly on pallet, need box labels on each one or just FNKSU?

Shipping pallet with just retail boxes on it, does each box need a box label or just the FNSKU?

I have seen this (or things like this) asked before but answers have been unclear so I’m giving it another shot.

I’m shipping all my product in retail packaging directly on pallet (my products are relatively large like microwave size so doesn’t make sense to put them in gigantic cardboard boxes).

I know I need the pallet labels, but as far as the individual units do they each need their own box label AND the FNSKU, or can I just put the FNSKU and put one box label on the outside of the pallet to designate the pallet as the box?

Any input would be highly appreciated!