Yup, you save a few dollars per verification on shipping in exchange for spending tens of thousands on training each employee to verify items. Mind you these are retail employees so turnover is going to be high. Also since they need to be able to verify everything they won't have time to be in store since they'll constantly need to be studying new products. That or you just have them work off checklists for each product in which case the value of the verification isn't great since counterfeiters will just buy those check lists and manufacture to them.

The end result is much much higher cost per verification, and a less trusted quality of verification. But you save a few bucks on shipping.