Levi has some stuff on the Registry, and I am pretty sure he has his own collection which likely includes a lot of rare material. I correspond with him a bit on the stuff I am still looking for, but have never asked him if he has any of it himself .
I have found that when I send him questions or observations to his email on his web site, I get fairly prompt responses unless he is at a show (
levi@707sportcards.com)