They were mailed to Art Bell - that's really all we know about their provenance. Art had a gigantic radio show in the 90's when he got them, and he was well-connected to people like Bigelow and many others at the time. So it's not surprising that he would've received them - he would've been a good choice to send them to in any number of plausible scenarios; someone high-up on the inside who wanted to get them out to the public, or perhaps a soldier on a recovery team who thought that it was wrong to hide them in classified projects, or perhaps somebody who got them from a relative. In fact that's what the letters that accompanied the samples had claimed - that the sender's grandfather had been on the recovery team of the Roswell crash. I don't know what to make of these letters, but they're pretty far out there. From my POV they're irrelevant, at least until we know more about the material itself. You can read them here: Art Bell - Art's Parts Anyway, the fact that Art Bell received them is irrelevant and unsurprising. And LMH only tried to have them analyzed, so that's irrelevant. What's relevant are these questions: "do they exhibit genuinely anomalous microstructure and do they exhibit exotic physical characteristics?" That's what we need to know. And that's what we're waiting to find out.