Is it true that dead alien bodies from a 1939 crash had been stored in a container in the basements of the Capitol Building, Washington DC?

This story first came into the limelight in 2002, when Willian Jones, a director of the Ohio branch of MUFON received an interesting letter from a woman named Lucile Andrew, the daughter of Reverend Turner Hamilton Holt. The letter held the top-secret information told by Holt to his daughter about one of his meetings with his cousin Cordell Hull who had been the US Secretary of State from 1933 to 1944 and was also elected as US Senator from 1931 to 1937.

According to the letter, one day when Holt was in Washington D.C., he was contacted by Hull who wanted to show him something extremely secret and asked him to never disclose it to anybody. Holt agreed, and Hull took him to a place under the Capitol Building where he showed him an amazing sight. There is no exact information about the time-frame of this secret but Hull served under the presidency of Franklin D. Roosevelt until his resignation in 1944....