My uninformed opinion is that fake industry parts & certification is all too common.
When I saw hot sections of jet engines being rebuilt and tagged as airworthy in Turkmenistan back in 1996, I knew what’s coming.
Just about every refinery and plant I’ve ever worked in has required an MTR with every piece of material that comes in, and then sends an NDE tech over to hit it with a PMI gun before any welding/fabricating/installing. It’s rare, but not unheard of to have the piece of metal in front of you not match the MTR that came with it. Mostly it was vendors trying to pass off 304 stainless as 316 stainless.