Have you contacted vet offices and low cost neuter/spay clinics? Since he is intact and someone may be keeping him, the finder may go and have him neutered.
Jennifer
update:
Ginny (Basenji lost in Dennis, MA) has been sighted several times, including by Cheryl herself, and is hanging around a specific area. A humane trap will be set up tomorrow, and her new dog-brother Tom is on the job laying down a scent trail for her. Keep the good vibes coming at them all, and keep your fingers crossed for good news in the very near future!
Laura Whitney
Arlington, MA
Don't give up hope; I thought one of my other dogs was dead earlier this year, (he's a deaf staffy); he was lost during the week of the blizzard… I said many prayers, and I live in a farming community, w/the help of a wonderful friend, and many prayers Jack made it home safely... a little thin, raw paw pads, but he came home alive (and yes the fence was fixed). I'll keep ya's in my prayers.