Unsolved Mystery: WHERE ARE TESLA'S PAPERS? When He Died, All His Drawings and Notebooks Were Confiscated by the Office of Alien Property...

60 out of 80 Trunks Were Shipped to The Tesla Museum in Serbia... 20 Trunks Vanished. and the FBI Vault Has Nothing...

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FOIA - FBI says that the Nikola Tesla Deathbed Papers Were Confiscated by the Office of Alien Property -

The FBI Says: That's NOT US - WE GOT NOTHING... Here is a J. Edgar Hoover Letter...

I Looked at Every Page of The
PDF Files and... There Are
Many Memorandums About Tesla, Many Requests for Documents from Researchers, Many Newspaper and Magazine Articles ABOUT Tesla... BUT NO REAL DRAWINGS OR NOTEBOOKS... or ANYTHING WRITTEN BY TESLA...

There are LISTS of What Was Confiscated...
AND THEY GOT A LOT!
But... Where are They Now?
There is Nothing in the National Archives Either...  
LINK: https://vault.fbi.gov/nikola-tesla

However - Some Papers Were Shipped to Belgrade, Serbia. 
In 1952, after a U.S. court declared Kosanovic the rightful heir to his uncle’s estate, Tesla’s files and other materials were sent to Belgrade, Serbia, where they now reside in the Nikola Tesla Museum there. LINK: https://nikolateslamuseum.org/en/ 
But while the FBI originally recorded some 80 trunks among Tesla’s effects, only 60 arrived in Belgrade, Seifer says. “Maybe they packed the 80 into 60, but there is the possibility that…the government did keep the missing trunks.”  
https://www.history.com/news/nikola-tesla-files-declassified-fbi

and YES, The Office of Alien Property Was A Real Thing!
Not a Joke!

Created in October 1917 within the United States Department of Justice, the Office of Alien Property Custodian (OAPC) ceased to exist in 1934 and its functions were delegated to the Alien Property Bureau (APB) in the Claims Division of the Department of Justice. On December 9, 1941, the APB was superseded in the Justice Department by the Alien Property Division (APD). The APD was abolished in 1942 and its functions were passed along to the Office of Alien Property Custodian (APC) within the Office of Emergency Management. APC was abolished in 1946 and its functions were transferred to the Office of Alien Property, Department of Justice. It was abolished in 1966 and most of the functions related to foreign assets control were passed to the Office of Foreign Assets Control (OFAC) in the United States Department of the Treasury.[4][5]

https://en.wikipedia.org/wiki/Office_of_Alien_Property_Custodian