Nah, no need to vet him, or soak him, or whatever. A snake with an intestinal blockage/constipation of any sort would NOT be eating. If he's eating, then he's fine. Blockages cause nausea and discomfort--any animal with an intestinal blockage stops eating (and/or starts vomiting). Snakes can be remarkably efficient, and they don't always go as often as they eat. He'll leave you an enormous present one day, wait and see.
A snake that size can eat a lot of hopper rats before he has to go.