I know this does not help your situation, but my buddy lost one of his dogs just outside of Centerville several weeks back. He was sick about it, searched for days, then figured the dog was lost for good. The following week he got a call from Oakwood, Tx that his dog had wondered up to a house. 32 miles as the crow flies, and over 1 week.
Hopefully something similar will be the case with your dogs.
Cantexduck had the same thing happen a few weeks back....dog was supposedly found almost 30 miles from where he got out. I can't stress the importance of having a collar with a phone number on dogs at all times....even when kenneled or on a chain. You never know what might happen.