Nah, Gren would be hiding in the bushes, his natural green pigment camouflaging him as he peers inside the shop through binoculars, making voice recordings and taking notes. He studies the social structure of the maids and their individual tasks, seeking out the strongest and most elegant maid within the shop. And for further study, he would occasionally tranquilize a maid and attach a GPS tracker to her and examine her health while out in the wild (I.e. off work) so he can monitor them outside their natural habitat.

Truly, Gren is a scientist and a hunter.