Does Anyone Have Experience With Counterfeit TPG Slabs?

I recently spent $50 to purchase what was represented as a PCGS MS65+ CAC 1912-S Liberty nickel. I knew I was buying a Chinese fake, but I was interested in seeing how the counterfeiters would do with the slab and the CAC sticker. The answer is that they didn't. The "coin" came in a little tin box such as one containing breath mints. There was no attempt at either a PCGS slab or a CAC Sticker. Just the coin loose in the tin box.
The coin itself looked like the real deal. It looked like it was struck on a quality coin press with no seems or questionable aspects to its overall appearance. I didn't try to grade it, but it looked reasonable to be a MS65+. Knowing it to be fake, I didn't try to learn and apply the diagnostics.
My question is whether realistic phony TPG slabs are a meaningful problem in the marketplace. I have read of fake coins in fake slabs, and the 1912-S nickel seems valuable enough to justify the effort of creating phony slabs. Does anyone have any information on whether persuasive phony slabs are really out there and how much a risk they are to coin buyers? I collect seated and capped bust coins where many coins that are better date but not semi key can sell for four figure prices. These seem like the coins most likely to catch a collector off guard.