what you just told me on the phone was correct, Bob Pardue provided the information on this seller and I still have to add it to the site

Seller is
TruGrade Services LLC
32 Broadway
Bangor, PA 18013

Also trades as
Bangor Coins & Collectibles LLC

and on ebay as 'bangorbound2'

Here is the website:
http://www.trugradeservice.com

Note that as with other such 'slabbers' we have investigated, this seller does not actually advertise slabbing of "chips" as a service offered on his site per se. We came to the conclusion he was encapsulating his own goods.
That, to some extent, is more worrying than someone providing a service to others only.