These are hard to find, usually expensive and need to carry certain earmarks of authenticity. Still, buyer beware.
The following appears to be authentic.
http://www.ebay.com/itm/ORIG-WWII-Te...item35d1996b26
The following also appears to be authentic. Some do not know that Technical Intelligence (referred to as T-2) at Wright Field in Dayton Ohio issued such reports.
http://www.ebay.com/itm/SUPER-RARE-T...item461242a6b6
Peace,
Ed