What I find interesting and supportive of these suggestions is that the photos are only of the exterior. Iran's claims seem to be over having found the airframe overlooking the fact this is meant to be a secret "spy drone".
Where are photos of, or even suggestions that they have, anything from the inside? Engine parts, landing gear, let alone any "secret" recon, satcom or uplink equipment.
Even if some parts have been shipped to China or Russia I can't imagine they'd want the collection of scrap metal which always falls out of a crashed aircraft.
Something in this story is missing.