So the short answer seems to be: They spent decades responding to everyone on the planet wanting to know what they'd taken from Tesla's room and that actually i

So the short answer seems to be: They spent decades responding to everyone on the planet wanting to know what they'd taken from Tesla's room and that actually it was all in the charge of the 'Aliens' Department (i.e. non-Americans) and in some storage place and the FBI hadn't taken anything. Then there were the others wanting to know about a Death Ray that Telsa had talked about (some saying it was the only defence against an Atomic bomb etc etc) - but no one ever found anything that he actually meant. The only list of actual inventions etc seems to be about page 40 of the 3rd set which is quite a fun list; some crazy, mostly about power distribution. Oh and there's a few Mccarthy era things. Meh.