It turns out everyone was wrong: the capsule was empty.
Suppressed by a small crowd of local historians and city officials, Potter opened the capsule. It took a few tries to clear the old door, but once it was, the group was disappointed with what they did or rather did not find.
"We were a little horrified to find there was nothing in it," Potter said.
The capsule was to be revealed at the adjacent celebration of London Day on Saturday. City Manager Kevin Smith broke the news in front of a frustrated crowd.
Derry historian Paul Lindeman told the newspaper that it had no list of its contents, but the safe was "said to include" a movie reel on a city driving tour.
Could anyone have broken the combination lock and stolen the goods? Perhaps. But it is also possible that there was nothing in it.
"We won't know what happened to them," she said.