I'm so sorry to hear about that!
I had an experience like this, but it was with a Rainbow Boa. He ate fine, drank fine... but I kept telling mum that something wasn't right. When I handled him, he'd curl around my fingers and just lie there. No baby Rainbow would do that - they're nippy and flighty as babies!
Not more than a month later, my gorgeous little Rainbow was dead. I know how you feel about losing your BP, and I'm really sorry. Definitely will never buy from that store. :/