I can tell you what happened. Some of the stuff is corrupted as hell which i doubt in this case, because items were massively spread. Some kind of bug, known bug and not reported by exploiters so they cen ruin the server. Or sql injection which will be amatauer mistake :D They can't do anything im pretty sure, the only way to catch expoliters is to check logs and that is impossible for this population of the server. Only suspected players can be checked, but others?