So, this afternoon before I went out, I went around the house baiting all the mousetraps with the peanut butter I bought just for them. On both the trip plates and the springs, in the case of the old-fashioned spring traps. Just now, I looked around to check the traps.
The mice definitely love peanut butter. They cleaned all the peanut butter off all the traps in the kitchen. Without tripping a single one. They don't seem to have found the ones in the office next to the printer. I'll have to hope they like the poison I also bought, since they seem to be too clever for the traps.