I ordered 10 snails from SWF.com also and also, only 2 outta the 10 made it!! Take them out and first touch them and see if it at all moves... Then if not smell it. If it is dead, there will be a horrible smell!!!
We also ordered 10 hermit crabs from SWF.com and they were DOA also! Why??? We think that it was because they were shipped in NO water! Not 100% positive but thats just our thought! Maybe it would be a good idea to try shipping them in water and some without and see which ones make it! Just a thought. Sad to see anything die!!! Good luck with the smelling!! LOL... Have a nice day!!!