The snake digestive system pulverizes bone......I haven't heard many issues as far as ingested substrate goes.

If you are still reluctant, placing the mouse on a deli container lid works, or you could go a step further and make a hole in a deli container for your snake to enter and eat in a substrate free environment.
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1.0.0 Lampropeltis getula holbrooki
0.1.0 Lampropeltis getula californae
0.0.1 Lampropeltis getula nigra
1.0.0 Lampropeltis mexicana thayeri
2.3.0 Eublapharis macularius macularius
0.0.2 Rhacodactylus ciliatus
0.1.0 Gerrhosaurus major major

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