I wanted to buy some printer paper today.
They had the sort that I liked (it's heavier than usual, at 100 g/m² vs. the more usual 80 g/m², for one thing), but all the packets on display were opened at one end.
I asked one of the employees whether they had any unopened ones, and he said he was afraid not. He also said that those packets are typically opened by people who want to be sure that the paper inside is not blue (the predominant colour on the packaging) but were indeed white. Whatever.