If "found" means "discovered":
* Lost
* Missing
* Uncovered
* Hidden
If "found" means "established":
* Lost (as in, "lost their way")
* Abandoned
* Unfounded
* Discontinued
If "found" means "established financially":
* Broke
* Bankrupt
* Destitute
* Impoverished
If "found" means "established in a physical location":
* Removed
* Destroyed
* Displaced
* Gone
If "found" is used in the context of a verb:
* Lost
* Misplaced
* Left
* Abandoned
It's important to consider the specific context to determine the most accurate opposite of "found".