There were signs up around the dorms. Someone might find the one putting them up lugging a few, and hopping up with tape in order to get them at eye level. That individual was tiny, and green, and believe it or not, grumbling.

The signs had a copy of Robin's headshot on them and read:

I'M HERE, I'M REAL, GET USED TO IT! If only he had access to a megaphone.

[Open for anyone who wants to see the signs or catch Robin in the act.]