"Found on Penns campus in Philly, made of metal, US quarter for scale. Some potentially private information on the paper script inside (not sharing the writings)."
A: "It looks like a geocache. It is a treasure hunting game, the information on the paper is probably names and dates of visit."
Thanks Internet.
"... and the liquid will drop through the slit in the middle."
Let's keep it clean; this is not an AO site.