I tend to DIY everything the first time and afterwards determine I never want to DIY again. This time its direct marketing to out of state absentee owners. Designing my own cards, having them printed from Ebay. Then I...

Two things come to mind:Send a postcard with return address correction requested, The US Post Office will find the forwarding address for youWww.findtheseller.comI've heard good things about that website

Then, through the magic of public record, you can look up who sent the postcard to see if they have ever done any deals or not.

Postcard marketing is expensive!

I was thinking about mailing a post card to former cash buyers?

That being said, it is possible that this lot is ready to go, simply needing infrastructure buildouts - assuming that the thousands of postcards sent to the owner over the years have gone unread, and that he has no telephone service, etc.

I want to increase the number of calls I get from my direct mail postcards.  

That's what posters and postcards are for.

(Another tip: in Word, if you're having trouble aligning the addresses on the envelop when you print, you have to use "Japanese Post Card" under "Page Layout" & "Size" and change it to Landscape so the area you're typing in is congruent with A2 envelope size.If you decide to get that HP printer I mentioned, you can order a 9,000 page yield toner at inkcartridges. 

I'm pouring over the threads for advice on direct mail campaigns as I've just done 5000 postcards with only 6 call backs. (2 remove my names). 1 bankruptcy, 1 pending deal, when she returns. 2 no deals.