The sign on the front lawn works !
Offer a reward for the info.
I had my atv stolen out of my garage. I put the sign on the front lawn, and 2 weeks later I had it back. 2 people down the road, saw a truck/trailer parked out on the street and then my atv came blasting down the street into the enclosed trailer. The neighbors said it didn't look right, and wrote down a partial plate number. The cops found the trailer/atv about 1hr away in another guys driveway. He was busted. I now have a very small wireless camera pointed towards the garage and driveway. It records everything to my computer hard drive 24/7 and can be viewed /deleted anytime.
Good luck !
There is always one neighbor that is always looking out the window, maybe they saw something.
TRY THE SIGN, IT MAY WORK !!!! YOU HAVE NOTHING TO LOOSE !!! ALERT OTHERS IN THE AREA WITH THE SIGN SAYING YOU HAD SOMETHING STOLEN, KIND OF LIKE LOOKING FOR A LOST PET.