That's very true. Now if they are giving them to you at a cheap price, $40- $50pr I could care less what they called them as long as they look good.
But yes, anyone with actual F1-F3 birds should easily and readily be able to prove it. After all, if they imported them themselves, they should have a ton of paperwork from the $1000 per bird endevor (and that's just the quarentine cost)
People have learned by calling them F this and F that, that new folks cant tell the difference and will unknowing trust them and buy them for higher prices.
But about the only person I know right now who still has this kind of stock outside the San Diego Zoo, is Mr. Summner of Tripple S Farms.
There are a few others, he's just the only one I know right off personally. It takes major dedication to do all that with forgein species.
So before you buy, if folks are selling them as such, ask like tenneesseered said, prove it. Show me the records or studbook on them, Triple S can