YES!The mice are coming back to the run. One of these days I'll block them but in the meantime, I get a perverse pleasure in trapping them.
I shoved a pistachio so tightly into the trigger last night that it was still fully in there with the dead mouse snapped cleanly at the base of the skull. I just removed it and reset the same trap.
The jammed nut technique works best I have found.
I sometimes wonder tho if the smell of death, especially if there's blood, deters others from going to that trap.