Some people have the oddest ideas for time capsules.I haven't seen that but I think I get it.
I worked on the retrofit of the Pontalba Building, a 200 year old apartments flanking Jackson Square in New Orleans. Just before I got on the job they opened a wall and found a set a leg bones.
There was an investigation and they found they were actually 'horse bones'. Lucky because if they were human it would have delayed the project.
Only thing they couldn't answer is, Why was the horse wearing a woman's shoe?