Rescue, horrid retained shed? Mites?

[Kb-]

Hello everyone, I am new to the forum-- and have signed up in hopes of getting some advise on a perspective rescue. A large pet chain has a young piebald that according to one of the employees, has been deteriorating rapidly for about two months. Very thin, super dehydrated. The store took it to a vet, who said nothing was wrong, so the snake remains on the sales floor in this terrible condition. It looks to me like retained shed? There are also small red dots on the white, any idea about those? I am meeting with the store manager tomorrow to discuss adopting the animal, because obviously they cannot provide proper care. Even a well meaning employee can't give the kind of time it needs while on the clock, am I right?

Anyway, If I end up with him this will be my second BP and first in bad health. I have set up a bin enclosure with heat mat, paper towel, large water dish and moist/dry hide. What is the best way to go about removing the stuck shed? What else can I do to help aid him?

I apologize for the lack of photos, the video was all I could get on short notice. If I am lucky enough to get him, I will update with detailed photos.