Mild 440 break in springs?

Are the lifters American made....or the box they come in. I do not know.

What I do know: Mike Jones aka CamKing recently stated that there is [a] only one company making FT lifters in the US & they are veeeeeery expensive. Check out on the SpeedTalk Forum.
So unless the lifters are expensive, I would doubt they are US made.
https://claysmithcams.com/chrysler-mopar-made-in-the-usa-hydraulic-lifters/