Even though I'm not an instructor in OK, I'd like to express my opinion on this. How easy would it be for any average person to obtain that cert, fill in bogus information, and submit it with an CCH application?
Here in NC, we as instructors, need to purchase certs that are serialized and issued from the state with an embossed seal. It's much more authentic. It's a pretty nice cert, too. The only downfall for the student is they need to turn that in to the local Sherriff anyway when applying for the actual permit. If they want they can make a copy of it, but the original must be submitted.
When you contact Cleet mention the fact of how easily their cert can be forged. Maybe that'll change their tune.