Many thanks to thchog. He found a good method to find proxy sites.
The list did produce forums that produced proxies. I am still working on but with some help or time I am confident the end result would search google and other SE on a defined date (2/27/2006-2/28/2006) range, grabbing new posts spidered by the meta crawlers. Should work for most forums, many where it will bypass U : P through cache. Here are the few I came up with or found that had potential.
inurl:"index.php" intext:"anonymous proxy"
inurl:"/forum/*topic*=*" intext:":8080" OR "80" OR "3124" "proxy"
inurl:"/forum/" "*topic*=*" intext:"*.*.*.*:8080" AND "*.*.*.*80" AND "*.*.*.*3124" "proxy"