I thought only root could remove a PV... or are you saying someone you let in went to your datacenter and removed a PV from one of your server?
If you are not more clear and specific it will be difficult to give you a usefull answer...
(What type of server - OSLEVEL - disk: physical or SAN? etc...)
The PV would have to be free from use, or do you mean physically stole it? I SAN LUN is more likely I suppose, but you are then after the LUN id. What symptoms do you have? Is there a disk listed as "missing" or "defined" when you use lspv or lsdev -Cc disk ?