Is there a way to tell if a rir is heritage at hatch

[chickenWill]

I have allegedly secured some eggs from a line dating back to Thomas Jefferson. wondering f they actually ARE heritage. just hatched [ of course at 4am this morning] lol....still wet bu are bigger than usual and appear to be a bit darker. Or do I need to wait till ey grow a bit? thanks in advance.No pics yet too dark in house this morning before work