OP - Thank you for taking such good care of this little one. As long as you are still looking for the owner, that's all you can do. I think it may help to post on craigslist about finding one but don't put your number on there. You are right about that. I recently learned that from posting an ad for my plumbing business. I get some pretty X rated texts. People have no life. But, as mentioned, someone could email you thru a link on craigslist.
What I would do, so your email doesn't get over run, is set up a special email account just for that purpose.