It really pays to be Mr Benalla!

This was posted in the comments:

The document CA/F 6/17 contains another juicy morsel on page 15: "Agreement No. 2106/3270 on expert security services" signed off by the EPO on 14 Nov 2016.

This contract was a direct placement, i.e. no tendering. The amount involved was EUR 1 344 000.
CA/F 6/17 does not reveal who the lucky recipient was: "Name of supplier not disclosed for security reasons. Information available on request."

If we assume that the same "security services" were involved (and Märpel never saw any other ones when chasing mice at night...), the total over the two years amounts to 1.8 million Euros, all spent without any oversight as to which purpose they were really spent.