This question bothers me a little. I've had my python, which is about 4 years old, for two weeks now. When I first adopted him I thought, "Wow, that is an awesome animal." As I have read more here and observed him more I think he has a couple places of old shed stuck (About 4 scales total) and his eyes (One or both, can't recall now) have a wrinkle which made me think he was shedding, but I think those may have been old. I know how much effort I am putting into keeping his humidity up for this shed, his eyes are opaque blue now, and I don't see that happening with his last owners.
To keep the humidity up I have put a wet wash cloth over the screen and placed aluminum foil over that, but thats not enough. To his disliking I mist his cage, and he hisses inside his hide so I wait till humidity falls below 55% to reduce the stress as much as possible. His hissing started and increased as his eyes got more opaque, which is understandable. I went to a reptile store but they didn't have spagnum moss, just some live moss and others that appeared to be geared more towards lizards. This store did however have a huge variety of snakes, lizards and turtles.