Wow that blows, thanks for taking care of it.
You have to put him in a small enclousure, BPs dont like to be out in the open. They like to be hiding somewhere small and sometimes tight.
For a BP that small try a 6qt tub, or maybe a 14-15qt tub. But if it's not even eating, try a 6qt first. Leave it alone for a few days, dont even touch him. It will need a hot side around 90-93.
A BP hatchling will eat about every 5 days when settled in.