Whether CB or CBB, the hatcher (as i think the title of breeder isn't deserved by this guy) is definately sus. But at the end of the day, no matter where the snake came from, as long as you can get it healthy and feeding, and with good handling, for $15 it's a steal.
I wouldn't worry until it gets to about 2 months. Then i would assist feed before trying to force feed. But i would ensure that you weigh your snake now so that you can track weight loss.
Ensure the temps are right - 75-85F ambient, with a 90F basking spot. Ensure that there is a nice tight hide spot for him to seek refuge in. Ensure that it is only in a small kritter-keeper type case (about 1 foot long and 9" wide). Try covering two sides of the case with newspaper to provide more privacy.
Some things you may wanna try -
Feeding at dawn and dusk
Braining (cutting the scalp of a rat and squeezing the head a bit) - the smell would be enough to entice anybody's appetite 
Warming the rat to various temps. 89-90F (32C) is about the natural body temp of a rat.
Try placing the rat and the snake together inside a brown paper bag, fold the end over, and leave overnight.
Try touching the rat to the body of the snake - this may be enough to get a strike, but beware, may promote aggression in feeding.
Try feeding only when the snake is cruising around his case
Try just placing a rat inside the enclosure whilst he's in his hide box, and don't disturb him. He may just wander out and eat in privacy.
Ensure that you only offer food every 3 or 4 days... you don't want to desensitize the snake to food, and have it believe it will always be there everyday when he wants it.
What food are you offering? I find that mine have shown no interest in rodents without a full coat of fur. So i offer small weaner rats first time round.
Don't try force feeding unless you know what you're doing. Otherwise get a breeder or qualified vet to show you.
Good luck. Hope this helps.
Cheers.
Aaron.
-----