Your snake is behaving normally. These snakes really don't do all that much.
Leave him alone, don't bother him, don't handle him, just let him be until he has eaten several meals in a row.
Then begin a slow regiment of handling. Like once a week for 10 minutes at first.
You know he can live for 30 years, right?
So... if it takes you 6 months or even a year before you can handle him regularly and before you see him moving around enough, its really no big loss compared to the amount of time you'll have with him once he's chilled out.
BP's are timid little guys and like to hide. He's doing what he likes ... well done.
Joel
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0.1 Ball Python
0.1 Okeetee Corn Snake
1.0 Leopard Gecko