Cornell University professor Dr. Carl Sagan has stated many times that there is no evidence that unidentified aerial objects—and presumably visitors—exist. To be precise, there is no publicly acknowledged physical artifact. The large body of encounter memories, some heavily freighted with imagination, others more sparse, amount to an artifact of something.
Ah, of course, your hypnosis-induced "recollections" are more valid than renound scientist Dr. Carl Sagan. (insert eyeroll emoji)
