Ask your neighbor, if it wasnt them, they may have noticed the name on the truck. Someone around you surely saw them working. Then once you find out the name, contact them. They may be back today, so make sure that someone is there, to talk to them. Make sure it is all back to just what you had, once they have torn it all out. Can you post a picture?

Why is it always a mistake in installing a concrete slab at the wrong location and not dropping off a bag of cash at the wrong address ;)

Lucky they weren't building demolition contractors!

Right? Here is a picture. They put it on top of our sprinkler system as well so that’s been damaged. So far none of our neighbors have said they were expecting this work to be done, so we feel like we’re at a dead end right now.

Try neighbors' ring cameras - somebody's got to have one. Usually a concrete company's vehicles (with wheelbarrows, formwork, lumber, etc) or an actual ready-mix truck if they piggybacked this job - is a little hard to be stealthy. Crazy! Good luck.

Any update on this mystery? A friend lives on a street that is XYZ Drive. His packages are often misdelivered to a house on XYZ Circle. Same house number and street name, the only difference is Drive vs. Circle. Is there anything like that in your area?

^ That's what's going on. Driver/installer misread the address.

Yup, Many many years ago, people at 1063 N Perkins Rd. got the gutters meant for 1063 S. Perkins.

Ha! those guys are busted! Last time they try to make some money behind the boss' back.