Paolo di Canio has been caught on CCTV carrying out a late-night raid on Swindon Town.
The League One club checked the footage after believing they had been BURGLED when club-owned pictures went missing.
Swindon have now changed the codes on the door locks.
A club insider told The Sun: "Even by Paolo's standards this was a crazy thing to do.
"The cameras picked out Paolo and three members of his staff sneaking into the ground at 12.45am on Thursday.
"They took everything from the office, including the photos from the wall.
"The door was protected by a pin code but Paolo had access from when he was manager. The codes have now been changed.
"If he wanted to come and collect his belongings he should have asked."