[bigbob]

I’m guessing turkeys would have been sitting ducks for domestication, so to speak. Not really fast or equipped with great natural defenses - just follow the maize...

[bgill]

The fact that we see a full clutch of unhatched turkey eggs, along with other juvenile and adult turkey bones nearby, tells us that these birds were domesticated

Or it tells us mama turkey died. Some eggs hatched and some didn't. The birds that hatched didn't have a mama so they died.

Our research tells us that turkeys had been domesticated by 400-500 AD

I'd lay odds for a loooong time more.