Originally posted by helowl:

I lost a bunch of Copper ore from chests and I am a solo player...

"Lost" can just as easily mean "misplaced". I have yet to see anyone else complaining about items despawning from chests, and mechanically it makes no sense for it to ever do so.

I'm willing to bet that copper went to another world, another base, or a chest on the other side of the house. Check the storage in your karve, too; it's surprisingly easy to toss something in there and forget it exists.