I've seen non-rev crew actually pre-board, before F boarding. I was on 3A on a MD80 recently. I was first pax on and just as I was walking in, the non-rev (who sat in the cocpit jumpseat (still assuming this was non-rev passage) put his suitcase in "my" bin (yes, I know it's not really mine
). Had to use a different bin for my carry on. Not sure I truly object. Just an observation.
Cheers.