Sorry, but ya got nothing.
Simple logic:
If you could show me or anyone something concrete you would have.
And if you had it you would have already been blaring it from the rooftops.
If you had it, it would already be in the hands of the media, the scientists, the pols, etc etc etc.
Instead, nothing, nada, zip.
Ergo, it doesnt exist.
BTW, that last post came out slightly wrong.
I wasn't trying to set myself up as the be all and end all of UFO adjudication. I just wrote it that way :D