According to this AP report, the cleaning crew at a bank in Hainburg an der Donau (Hainburg on the Danube) east of Vienna was puzzled by a smear on the glass entry door. Viewing the surveillance video turned up an explanation: A wild pig had pressed its body against the door and opened it, and after spending some time inside the visitor left. The door was found locked and there was no sign of damage or any indication anything was missing, so the swine's purpose is a mystery.
Of course, there's one thing you can take and still leave behind:
(There's a surveillance photo of the suspect here. If you recognize the pig in question, contact Austrian authorities or Interpork.)