Treasure farming

do the chests/do not touch/buried treasure ever spawn? or is it only for each separate character

They don't spawn, they're always ing the same places. The junk in them is random, but that's about it. You can take each one of your characters to get them. I think they reset once a month? I could be wrong there, just check on wiki they've got a section on it there with maps to tell you where all of them are. Awwww heck, here ya go.

http://gw.gamewikis.org/wiki/Treasure

well...its been about 2 months since i opened them, and when i try to open says nothing is in it

The resetting is random and by character, not account.

Try again next month.