1. I'm happy for you that your snake ate
2. I'd never suggest leaving your prey overnight unsupervised.
3. I'd suggest considering the possible vet bill for an injured snake would far outweigh the risk of a fast IF your bp is not losing considerable weight or showing signs of malnutrition.
I think you dodged a bullet this time and hope you don't put your animal at risk to aleviate your own stress over the fast in the future.