In a nutshell, we will never know as much as we don’t know.
"Several former and current DoD officials also told me AATIP had indeed successfully collected much more imagery and data than has been made publicly available thus far. Reportedly, this includes videos of UAP flying in formation for extended periods, images captured at close proximity (by some accounts as close as 50 feet), along with other examples of high-fidelity imagery, possibly even showing objects moving underwater through airborne synthetic aperture radar.”