I've worked in food businesses all of my life and pest management is part of it all.
The sonic plugs don't work. Don't bother.
What you need is breakback snap traps. Ideally you then put them inside a bait box.
So this is what a trap looks like:Snap-E Mouse Trap - AFS
Then this is the bait box: Snappa Mouse Bait Box - AFS
You must buy the ones specific to mice because otherwise your mouse could do a tap dance on a rat trap and not trigger it. You might be able to buy similar online from amazon.
The traps should be set up perpendicular in the boxes so you can see the yellow bar through the top. and the holes in the box should run along the edges of the room or cupboard.
Rodents are naturally neophobic (fearful of new things) so may not go in immediately but as you're doing this at home, you can use food to bait the traps. Peanut butter and chocolate are good choices (cheese isn't) but better still, if they've gone after the dog treats, use the dog treats. That's what they're used to eating.
I'd bait your kitchen if that's where they went for but also I'd bait some other rooms just in case and your loft.
You will hopefully start catching them but leave them in place (don't touch them) unless you don't see the yellow bar anymore, in which case you can open to see if you've caught anything. You need to give it some time. Don't assume you will catch them in 24 hours. If you do catch some, rebait the boxes and put them back. Mice breed quickly and also nest inside so there is a chance you have an infestation.
Don't use toxic bait except as a last resort. It takes a long time for them to die and they will crawl off somewhere in your house probably to do so.
Give it at least a week with traps down before you can be confident you've caught them but honestly I'd probably leave a couple down for months in your kitchen just in case.
On other things. As others have said, throw away any food which could have been contaminated and clean cupboards with detergent, rinse, then I'd use a bleach spray or bleach solution if you can. I'd also block up any holes. Mice can squeeze through a gap as small as a pencil width. Expanding foam is useless as they can chew through it. Properly seal gaps with mortar or if no other option as someone else suggested, use wire wool in it too. Also it's worth checking for chewed wires etc as fires can be caused by mice damage.
Or the alternative is to get a pest contractor in to resolve it and also look for access points and damage. Get a report out of them as well on what they've checked if you do that. Honestly, despite my knowledge, I'd bite the bullet and pay only putting down traps myself if they couldn't come in the same day.
Lastly I'd have a look around the outside of your house. Yes building works can disturb rodent burrows. So that could be it. But if you put out food for birds or have a compost heap (rather than a protected bin) they can be attracted to that as well as any water sources (ponds, bird baths etc).
Please don't bait outside though as that leads to birds of prey deaths sadly.
Lastly you might find some people advocate sticky boards. They are almost outlawed in the UK now. I've used them when they were legal and honestly they do work but they're super cruel and really you have to be prepared to check them every few hours (day and night) and prepared to kill a mouse stuck on the board. You probably can't get hold of them now but for domestic use I certainly wouldn't. They're pretty tough to stomach.