It's been 3 months? I'm curious to see what others say, but
if you've done everything you can up to this point to get the word out, I'd stop worrying about it. There's always the possibility the original owner will show up, but I think you've met your obligation as far as "waiting" goes.
MG, if Ginger were gone 3 months and I hadn't found her, I'm thinking I would have to give up. (now I'll be having nightmares about that
)