This is a fun find. The first several files contain some correspondences about a person demanding information, but there is not much to go on other than that someone named Leon Davidson is involved. This file spells out the issue.
Apparently, Davidson recorded a communication that he believes is extra-terrestrial. He sent the sample in to be analyzed and is waiting to hear back. Apparently, he was also quite vigilant with following up. Finally, Wallace W Elwood, a Captain in the Airforce, tells Davidson that the message was just Morse code from a known radio station, to which Davidson replied that it was not characteristic of Morse code.
He seemed to also threaten to write an article for "some space magazine," claiming the Air Force was concealing information on flying saucers. The communication ends on this intriguing line:
“INCIDENTALLY, DAVIDSON IS NO X NO FOOL AND IT APPEARS THAT ATIC IS TREATING HIM AS ONE IF THEY THINK HE CAN BE SATISFIED WITH A SOP SUCH AS CAPTAIN ELWOOD’S.”