I ran into a similar situation last year coming across the carcass of a 5 pt bull. I assumed it was lost during the archery season - one antler had been chewed on considerably so there was no question it had been down for a while. I left it there and asked the FWP gal at the game check station about it and their take on packing it out during an open season. She replied that if it was obvious it had been dead for a while, then there would likely not be a problem bringing it home, but also said that I would certainly be questioned if I did bring it out.
