As I ordered the batteries to a product picture showed with those button cells in the original package the technical notes and -wichtig - specifies the minimum excise date. But come that button cells are in an unmarked plastic strips secured from below with masking tape to fall out. According to Panasonic Hamburg (not far from me) it should however act goods after a check is genuine.
Do they do, but I lack the expiration date, therefore not a perfect score.