Sounds like we've had some similar experiences. My guy ended up eating the 1st Thursday after getting him when I left the room and then the next week I left the F/T overnight and it was gone the next morning. You may want to try leaving the mouse and see what happens.
For the 1st week or two, I may have caught a glimpse of his head peaking out of the hide but this past week, he's been pretty active around 11pm. Anything before that, and he's in his hide. My plan is to hold him 48 hours after his 3rd feeding on Thursday.
Keep us updated!