I don't know about all of that. I know my husband is a landscaper and uses gas cans on an almost daily basis. I asked him when was the last time he saw a metal gas can and he said years ago. I asked him if at any of the homes where he works if he has used or seen a metal gas can and he had not. I then asked him if all the three million times that he has gone to a has station to fill a can if he ever saw a sign or anything to indicate that it was "illegal" to use a plastic can and once again-negative...so I am not sure what the good google search is telling but the reality of what we see day to day here where we live is that hardly no metal gas cans are anywhere and for sale in our Lowes, our Walmart, our K-Mart and our Magic-Mart are ALL plastic cans...so Osha or whatever state agency has mandated this "law" might want to come into Virginia and have a look-see...because that law is not being observed in these here parts.
And that can of Georges, to me, looks much older than just a few years...it looks ancient to me...but that's just me. Perhaps they will ask him when and where he got it and he MIGHT tell the truth and we can know for sure...but then again, this IS George so the odds are against it.