As above, peanuts are good, and I've had great success with a piece of chocolate. Wear rubber gloves when setting the trap, I think they can smell your hands otherwise
I think you are right about the hand scent: after I re-baited the one in the kitchen with bare hands (had gloves on the first time) it never tripped it again. He cleaned it once and cleaned-and-tripped it a second time, the 3rd time (without gloves that time) it's not been touched nor moved. My wife won't share her chocolate, though...
We caught one! I put out a pair of those 'sticky traps' next to the regular traps. Last light I heard some small thumping sounds in the front bedroom (it's really our 'storeroom' for everything) about midnight, but had just finished assembling the 750K5 into the frame and was too tired to go check the traps. Today I found a mouse stuck to the sticky pad next to the trap, almost dead, probably from struggling all night? I added it to the one that also got nabbed in the garage trap last night, busy night!
So now, we'll see if there are/were more than one in the house? They are ALWAYS in the garage, but there isn't a way from there into the house, I fixed that years ago.
I use glue traps when my cats have a hard time.
Thanks for the sticky hint, Gurp! I'm sold on those, going out to get some for the garage tomorrow. I've used the big, flat ones for bugs for years, but they never turned up a mouse, I don't think they are sticky enough to hold them?