My worst mistake was not checking for mites. He’s a BEL too; looking back, they were so obvious. He also had a stuck shed when I got him and subsequently didn’t eat for 4 weeks, both of which I assume came from the mites. Basically, I ignored all the red flags because he was sO cUtE and outgoing.
Luckily, I was able to treat the mites fairly quickly once I noticed them. My first snake made for a VERY steep learning curve as I was frantically researching every micro aspect of husbandry trying to figure out what I did wrong.
So, yeah, message received: always thoroughly examine any animal BEFORE purchasing it.