A mouse hopper is way too small for even a hatchling Dum. I'd go for a rat pup at least.
And unless you know for sure the last time they tried to feed it, you might just want to let it be for a 5 days or so and let it settle in. Don't wanna push a problem feeder even further off course.
Cool thanks for the heads up. Maybe I am thrown off by the size of the snake then. They said he was 1 and half to 2 foot long yet.
Should I isolate the snake for 5 days. Keep him out of main traffic areas in his own private room?