I wouldn't say that those creases are a problem :] Its like when you lay in one place for to long and your skin is pressed up on something like a pencil or a wrinkled up piece of paper, it leaves an indent in your skin but it goes away eventually.
Hook training a boa isn't a bad thing and is very much possible like you have heard, but I personally think hand handling a boa is better, you get to know the snake better that way, I only really like handling a snake by hand is because my boa loves to climb onto my head and nest in my hair xD Its really cute, well for right now, when shes bigger I don't think it will be acceptable.
He is very beautiful and looks like a wonderful boy to have around :] Good luck with your hook training! And have fun with your boa ^-^
~Kaala
