Here is a link to an online network with good advice:
Tough to follow some of the advice such as "knock on doors" when they left on wheels. That's why TV would be best. It can't hurt to make a call and try to get them to pick it up. Maybe tell their back story so they know how deep your commitment has been to those two and how deeply they are wanted. If you can find time to post your area and a description of them, and maybe pics, I am off work today and can add them to the various lost pet lists online. Hopefully they will be recovered quickly and none of this will be neccessary, but if not, speed in getting the info out there might help.
Best wishes,
Beth
