Wild Trout Trifecta

I've caught a decent number of wild rainbows like this. They're in a trib to a stocked stream that doesn't get fingerling stocking of rainbows.
But did it ever get federal hatchery stocked, spring spawning RT back in the 1940’s or so?
 
What are ways you'd determine between a fingerling stocked rainbow, especially one caught in streams that don't have known fingerling stocking programs, and a truly wild small 'bow?
I don't think you can tell because all those photos of so called "wild" rainbows I've caught fingerlings IDENTICAL to them before. All I know is that a class A I fish a lot that gets rainbow fingerling stockings every year and I'll catch a few MILES from where they were stocked in that stream.
 
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