As others have said, it is a big deal and there are certainly more mice. Set traps.
I have a buddy who keeps a catch-and-release trap right next to a snap trap, so the mice have a “choice.” He spray paints the tails of the ones in the live trap different colors to see if they come back after release. He took a pink-tailed mouse two miles out into the woods last week. Mouse was back a few days later.
Snap traps tend to kill instantly, so I find them humane. My issue is with the mice my cat catches – he knows they can’t get out of the bathtub so takes them there to play, then gets bored and doesn’t seal the deal. Internet says that suffocation in a jar or something is the most humane way to go in these situations, so I’m going to try that next time instead of having my fiance do the big stomp.