This has provided me with a few moments of amusements.

In the UK we have a TV program called "Antiques Roadshow" where members of the public bring in items for experts to analyse and value. Despite the title, items don't have to be old, so plenty of 20th century stuff turns up. Someone brought in their collection of phone cards (the pre-paid ones that you could use in some public call boxes a couple of decades ago). He was very proud of all the limited edition and picture cards in his collection, but the expert was disappointed that there were no standard ones. Despite being produced in their millions, nobody thought to keep a few of the vanilla ones, so they are now the most sought after!