I got a friend helping me out. There are a couple of parks nearby, if someone knows an aixin mama in the area maybe they can keep an eye out for fliers. So far, website and vets have not produced results.
Of course I will have him neutered.
ASAP. When he is handed over, he's gonna be all set: vaccines, deworming, the works. We're waiting for the "beautifying" process to be over, plus checking his health.