I once bought a bunch of mice from a guy who got them from [big name company deleted] and actually started a thread about them.
They were scabby, creepy looking, kind of frost-bitten/anemic, had tattoos on their tails and none of my snakes would touch them except for one garbage disposal BP.
He didn't regurge but went off feed for two weeks.
Hubby said they didn't smell odd to him but snakes no doubt smell things more acutely than we do.
I threw them out.