That doesn’t look like stuck shed and is not missing scales. I think it’s just the coloration of this particular pinstripe BP. If you’re concerned, just run your finger across it to make sure it’s not flaking. Pinstripes vary in patterns and this is a nice busy one.
Some forumers here won’t buy from chain pet stores (personal opinions/preference), but they do have some nice animals now and then. If the snake if healthy, eating well and you like it’s temperament/personality and the way it looks, why not go for it.