House of Burgess

I absolutely hate getting the mail. Hate it. Hate it. Hate it.
And the thing is, I used to love it. When I was a kid fun things came in the mail all the time. If it wasn't a card with money inside of it from a relative in commemoration of one of many holidays then it was one of the many magazine subscriptions I had like ZooBooks or Boy's Life or Sports Illustrated or Entertainment Weekly (It probably goes without saying, but I was subscribed to these all at different points).
Lately though, I've been considering getting a magazine subscription again just to make myself feel better when I'm confronted by the barrage of bills, junk mail and general bad news I'm confronted with every time I dare to shove the tiny key into my mailbox. To be fair, my friends and family do send me cards, packages and gifts regularly so I can't say it's all bad, but for the most part I find I have to crunch a few antacid tablets every time I do check my box.
So imagine my surprise when I opened what looked like a handwritten birthday card from a resturant here in town I had never been to. Inside the card, which addressed me as Robert, was a free entree coupon to be used any time before the end of the month in commemoration of my 25th birthday. I was pleased to get the Star's Restaurant voucher, but was also confused about how they knew so much about me.
Puzzled, but also hungry, my girlfriend Ash and I went that very night and had a lovely, well-decorated meal at their fine establishment. As I was paying the bill I asked the waitresses where they got them from. They seemed similarly clueless as to the source of my information, but one of them said she thought she heard the owner say that they bought the list of names, addresses and birthdays from somewhere, possibly a dentist or a doctor somewhere in town. I said that I appreciated the thought, it was actually a pretty good meal, but I left still lacking a definitive answer to my question.
Who did they buy this from? Has anyone else received these?
Until I know more, all I can say is that potential identity theft has never been more delicious.