Burrowing Pythons are very shy snakes. First off all, check his setup.
1. Make sure it has an adequate amount of shavings to burrow completely under.
2. Then make sure there is a warm end to the cage and a cool end. Heat tape is best for this, but a heat pad with an adjustable rheostat will suffice. Heat lamps and lights are not adequate since the snake will avoid the light.
3. Leave the snake alone for several days. Don't handle it or disturb it in any way.
After a few days of this, offer it a few fuzzy (crawler) mice. Put a handful of the fuzzies in the cage together in a pile at dusk. Make sure the food items are no larger in diameter than the snake's head. Calabaria have relatively rigid skulls and can't readily eat the large food items most snakes can.
If the snake doesn't eat them, sometimes you can get Calabaria to eat by stimulating their constriction response. Gently unwind the snake without picking it up. The more gently you can do this the better. Then take a wiggling fuzzy mouse and gently press it against the snake's body somewhere in the last half of the snake. Most Calabaria will reflexively coil around and constrict the mouse. Then gently close the cage, shut off the lights and leave it alone. If it eats it, try 2-3 fuzzies the next time.
That's what I did here -

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Chris Harrison
San Antonio, Texas