Spar cashiers seems to rob customers of theirs stickers

I would like to remind Spar Ninapark cashiers that they need to give customers the poiinnts stickers . The cashiers seems to take advantage that we do not know abt these points, not sure if they keep for themselves, I went to spar liquor only remembered at home I shoukd he e gotten stickers, and also at same spar Ninapark, seems it is a norm.