I found out the guy is opening a box. When that one gets low he opens another box and puts the leftovers in the new box. That's why i have'nt scored one yet. I caught him doing it at lunchtime. Went back and brought 5 packets lol
I think my newsagent does the same as he has 2 boxes on the counter and they have texta writing on them and when i went in today the boxes were full again and the marks were still there