I'd completely forgotten about this, but I thought it was due for an update, seeing as there's been some significant developments over the past couple of months.
Firstly- the security staff at the Uni came in and placed hidden cameras in the office a few months ago, and left them there for over 3 weeks. Someone must have tipped the thief off about it, as nothing went missing during this time.
After 3 and a bit weeks, the cameras were moved to a different office in the same building, where thefts had been reported.
A week later, and a thief has been caught!
Turns out it was what we thought all along- one of the night porters. Apparently a few of the people in my missus' office knew who he was (a right scummy wee bastard)
When they told him he was being sacked for theft, he started kicking off, threatening employment tribunals etc...
When he was shown the footage and the stack of evidence, and then given the offer of going quietly, or police involvement, he settled down a bit.
So, he's buggered off now with a permanent black mark on his CV. I don't like reveling in the demise of others, but this guy had it coming.
I still reckon they should have got the police involved, but he's not there any more, and nothing's gone missing since, so there's maybe not a great deal of point.