What Would You Do?

Sounds like you have had several communications. In any of them did you ever exchange telephone/cell phone numbers? That's the first thing I did when I bought my '69 Dart on eBay. Voice contact is so much better than email/text messaging.
I assume you have a name and an address. Check a directory to see if you can get a phone number. If necessary, post up a request here on FABO for someone in the San Diego area to drive to his address and check for you.