after getting the bug to flip a house, we noticed a house in our neighborhood that's been abandoned for quite some time. The owner tried to sell it a while ago for about 1/2 the zillow zestimate and there's no apparent life in the house. They now live about an hour away and have an unlisted number. They're in their 70s and I haven't been able to get a phone number, social media contact or an email address. I have their physical addresses, name and public house information (home data sheet). This looks like the ideal flip: not yet foreclosed/motivated seller with a tiny mortgage. And we may look to actually keep it. Any ideas how I can find out contact info for these guys?