Don't rule out critters for messing with the stuff in your garage and playing with your sprinkler.
My two big near embarrassments with the neighbors from different houses:
1) Almost accused latest neighbor of mowing by hostas with his wild swipes on his new ZTR mower,
but found out that the deer were eating them
2) Almost accused neighbor of cutting my starter wires on my truck.
We had been arguing about his kid's Quad racing in my yard.
It turned out to be a deranged groundhog, eating the wire for the salt!
So have you found anything? Remember smaller critters (<65lbs) usually won't trip a motion detector