1942/1943 Copper Plated Steel Test Planchets

I spent a bunch of money and time trying to get one that I've had for over 40 years certified. NGC, PGCS and ANACS all refused to grade or certify. NGC requested a COA ? NGC has already graded/certified four from "a private collection", but still would not even consider looking at mine. I was told that there are too many fake coins on the market to venture into grading/certifying. I'm kind of thinking that DBM may be correct in his assumption.