OA for DC Silver Age Keys

[OAFan-migration]

Got the idea for this thread from the great conversation going on regarding JIM #83.

 

Finding the art for original Silver Age keys, or at least knowing that they still exist, is a topic of no small interest to me, and I'm sure several others as well.

 

Does anyone know which art to DC Silver Age Keys is still out there? Are Showcase #4 or #22 rumored to exist anywhere? Brave and the Bold #28? I know the cover to Brave and the Bold #34 is out there, what about interiors?

 

I've heard apocryphal rumors about the art to GREEN LANTERN #1 all being held by one collector, but the earliest art I've seen has been from the Sinestro origin and first appearance in GL #7, which was recently broken up. . .

[alxjhnsn]

I was wondering how much of Swan's LoSH work from Adventure survives?

For that matter, do any of the Adventure books survive, e.g., 247.