It is not the right thing in a big picture. The cost of implementing (and understanding, in case of abuses, legal issues etc) of the returning process may be higher than apparent losses due to wrong shipments. There is no one harmed, except Amazon who already accepted this chance, evaluated it and said will not care.

It seems that if you made this mistake, it would ruin your own business, but it is not the case with them.

If you want to help Amazon get more money, let’s all order subj boxes, because for mass-enough wrong shipments they’ll take care and fix it. Someone could do a small short-lived business even, receiving these boxes, relabelling them correctly and reselling under the right markings. It is called arbitrage and there is nothing wrong with it. You take advantage of some inconsistency and make it so explicit that it either is fixed or left to you as a reward for fixing it.