mice have been getting through a certain area for a month now, i've had a trap on it since then, but its gonna shit out eventually (still doing good though, so props to that)
in preparation, i've created a kill box to contain traps, that way the cats can't fuck with the metal ones & hurt themselves which i switch & the area is technically sealed too
the chicken wire on the ammo box gives way for a mouse to think its open, and it also lets me see from afar if its sprung

the reason i don't just seal the way entirely, is because its at an area thats not really sealable
plus, they'll always try to get in either way, so its best to just kill them in the end