I just got GSP today! There super duper hardy and I just found that out today. What happened was that there was a hole in the bag that was holding the gsp so when it arrived part of it was sticking out of water. Thats not the end of it...Also the water was super cold because I guess the insolation wasnt that great. But after crossing my fingers, its still alive =)
Also, this was 2-3day shipping so im sure you would be fine with that. As for 'damp' do you mean you want to wrap a wet towel around the frag? If it were me, I wouldnt try it.