I can't find any purchase history or the address where the tax bill is sent. 

We had to take them down and open up the wall to address some plumbing concerns so keeping them was just not feasible.

I plan to print a “personalized” letter (interchangeable name and address) and hand-sign the bottom of each letter in blue ink, and then handwrite the info on the envelope.

When addressing them in text, emails or casual chats I typically say “yes sir” or “yes ma’am”.

What do you do when your direct mail bounces back despite the mailing address being correct?

If he said it was always cosmetic and it's still cosmetic now, just let the cracks settle out for a couple of years (super-cheap bandaids in the meantime) and then get them actually addressed once the foundation stops reacting to the stuff that's been done to it.Foundation repair in Texas is often a scam on the order of mold "mitigation."

Over the years they've compiled to appx 50,000 emails and I'd like to convert this to a Google Sheet with a few columns (title of message, body of message, email address of poster, date posted, and if possible files & photo attachments).

@Eric Trostle and @William Hochstedler I showed up today at 18:30 at the address given, however there was nobody there.

It's reassuring to hear that sometimes it's just a matter of getting some skin in the game as soon as you're ready.  

Hello EveryoneI'm looking to buy a standard lot which is a buildable (as far as county says) has it's own address, is zoned single family.The wetland on it is isolated and there are many houses around the lot, the neighborhood is established.Seller has a permit from Florida environmental protection, allowing to build a SFR with a plan to keep part of wetland on the backyard.