Interesting reading over on the CT-100 Site, seems this guy named Andy Lee located three NIB 15GP22's one of which was good.
Strangely enough they were addressed to the Philco Corporation!
Read it here:
http://home.att.net/~pldexnis/HoF/AndyLee-bonus.html
Maybe these were originally intended for one of Philco's prototypes?
Also check out this stunning screen shot from said set:
http://home.att.net/~pldexnis/HoF/AndyLee.html
Eric