Got your attention! Great! The reason that this took so long is because we had to dig up from the attack archives and decipher SLOPPY HANDWRITING in reports. Point is that in the records of the Prior Incantato on Bullstrode's wand, we found, among the recorded Portkey set ups that were part of his job, connections to abandoned Portkeys that were found at the scene of two Death Eater attacks so far (one in January and one in March, both of this year).
All of this stuff is recorded in a file on my desk, locked in one of the drawers, and it's all written evidence. We have cause to arrest him, Moody.