Good history—but we know from a former Department of Energy head (Dixie Lee Ray) that she had custody of the craft and bodies when she was Secretary.
The details are discussed in the Vallee book.
Because the craft landed adjacent to the nuclear test site the Atomic Energy folks took control of it—and as far as we know never relinquished that control (except probably to contractors).
There is a lot of evidence that the now Department of Energy, the Air Force and the Navy (to give just three examples) have been competitive and non-cooperative in this field—trying to hide the information from each other and other government agencies as well as the public.
This is part of what Congress needs to address.
Dixie Lee Ray also was governor of my state and my dad knew her somewhat because he was an executive-level manager at Hanford. I have heard in vague terms about her organization having had custody of a craft but the topic never came up in official meetings at Hanford!