Unless it ingested bedding equal to the size of the rodent you fed, I don't think you need to worry.

There are no paper towels or newspapers in nature and they generally seem to do quite well when it comes to eating.

Remember, these snakes are designed to eat dirt and pebbles and all sorts of debris.

So, unless there was a LARGE amount of bedding swallowed, and I mean a LARGE amount, chances are very good your snake never even noticed it was eating more than a mouse.