Something incredibly strange happened at a house party that we hosted

So we organized a house party at our place a couple of days back (Friday evening)

Everything ended around 3 AM and everyone went back to their places. I went back to my room to sleep.

The next morning I wake up and see a brown paper bag on the centre table in the living room. From what I remember, this bag wasn't there in the night.

I wasn't sure what it was so I opened to check the contents. I found a pair of spectacles inside.

And something incredibly random... A pair of car keys (photos attached)

I spent the entire day yesterday contacting all the people that were there at the party (around 25 of them)

No one has claimed these keys or glasses to be theirs.

I find this incredibly strange - the glasses seem to have power and both the car keys seem to be real as well.

I am freaking out a little, because it doesn't seem like a joke, and why would anyone not own up to their own car keys?!

What should I do?