There was a similar case at Valley in the late 90s which was also attributed to sabotage on the grounds that there was no other possible explanation for the seat being in the state it was found in.
Was a case in Germany too when the Boss found his Jag drogue was disconnected in the head rest........ Sabotage was suspected and everyone was interviewed by the SIB........ nothing ever came of it, sad that these things happen........ Personally didn't like the guy, but I wouldn't wish that on anyone.....