I have heard stories of Snakes Guarding trasure.
First off Snakes do not stay in one place
they would crawel off to hunt.
Getting bit by a snake would be Coincidence.
so would getting bit by a spider or other Bug.
I don't think anyone would build Closing walls.
Earthquakes or a big round Bowling Ball :P
A Created cave-in would be stupid.
Would prevent the Hider from retrieval Also.
I would also add any trap would probably be
so lame it would be obvious.
Other then maybe a Pit but that could also be
coincidence if boards just happened to rot.
Covering the treasure with a pile of rocks would
be most realistic. traps would be Natural a "Hernia"
or Broken toe
Would always say Be carefull. I just believe booby traps
are only in Movies & Fictions to make them intresting.
Why would anyone hide a cache in the open ?
Only if they were sure They would be the first back
or didn't get the chance to hide it better.
I wouldn't risk a Booby trap working
Final Thought.
Caves are accessable by Animals of all sizes.
Any traps like trip wires
would be set off a long time ago