If your guy is on rats leave it as it is.
Some snakes xan get picky. You don’t want him to like the mice and stop eating rats to save a few bucks on feeders.
Also has he ever eaten multiple prey items. You don’t want to cause a regurg or something. I’ve fed my colubrids multiples and even my carpet but never my bps.
Really your call but I would toss em or give them to a local keeper or pet shop so they don’t go to waste.
You coukd do as stated above. It’s not bad advice. I just personally wouldn’t.