Now that is cute. Very cute. I can't think of a logical reason why anyone WELL READ ON THE TOPIC would expect the Smithsonian to have any such artifacts. Sounds like more denial and being out-of-touch with reality in terms of the realities of the topic.
Evidently some readers are also unaware of the findings of the archeological dig at the Roswell site. Wherein multiple different laboratories noted that the bits of debris did not match known alloys etc.
Then there's the realities involved with SOME of the implant retrievals.
Fascinating the degree of ignorance and denial coupled with ABSOLUTIST statements. Curious.
Whoop di doo.
Aha! From the Monty Python movie, " Bring to me a shrubbery" now takes on a greater significance mayhaps?
Still no artifacts.
Why would you consider the Smithsonian Air and Space Museum as a non authority? I would trust them sooner than you are your dear cherished family member.