I had something similar happen to one of my caches. Someone thought that the cache had gone missing and replaced it where they thought it should go. Unfortunately, the hide was nothing like it was supposed to be and in fact the original container was still there. However, it took me a while to realize that and imposter was just being signed. Once I noticed, I notified the wrongful signers and gave them a chance to resign within a reasonable period of time. Most resigned. The thing is, as a cache owner thought and preparation goes into each hide (or it should) and when someone adds an impostor cache to make it easier to sign all you are doing is diluting the game not living within the spirit. If a cache has a difficult rating or a discription that would possibly indicate something is not right about the easy find, then the onus is on the cache finder to make sure the are finding the correct cache and not the bogus one. Otherwise why not just throw down a container near every set of coords and say you made the find.