Decoys have a habit to appear in unusual places. Colorado has no carvers that I know of so that leaves the rest of the country in play. Having never seen the birds, they could be DU birds or some factory birds. I’ve been playing with antique birds for over 45 years and a new discovery always raises the heartbeat, this is what collectors dream of. I bought 2 gunny sacks full 35 years ago and hit a home run, that happens only once in a collectors lifetime.