I think you were smart when you bought them.
Most people don't pony up and pay the premium.
Truly a very rare exhaust system.
I IMO, I think they should be reproduced, not to makes yours worth any less, just that through time and we aren't getting any younger, the few that truly appreciate this stuff is getting less and less every year.
Time isn't always on our side.
Good luck with your Tri-Y's what ever you choose.