You might try bribing a couple of birds. Seriously. If your driveway is close to the porch (like mine) fling those slimy sams onto the driveway, they'll either fry or attract sharp-eyed birds. Just don't hang around--go away and sooner or later they'll spot 'em and snap 'em up. I had some house sparrows do that with grubs. I dug up a few the first day, after that, they went hunting themselves. Robins will do the same thing with freshly turned soil. I suspect that one of the sparrows was a fledgling that fell out of the nest, and since I couldn't reach the nest, he stayed in some dense yews and I fed him dog food and ground meat, with a little bird seed. I never tried to hand feed him, but he wasn't shy, either. I suspect he was the first one on the scene and gobbled up so many I didn't think he'd get airborne! (He did.)
Anyway, the prevention tips are valid, but you might want to toss any strays on the drive where they can be spotted.