How important is numbers matching?

I let the guy know later I didn't appreciate him giving out misleading info even though I should have checked it out to be sure.Just totally overlooked it!Sometimes I find myself a little to trustworthy of people.I think overall the car was a decent deal even with no matching numbers. Car is going to be totally different than when it came from the factory so the the numbers matching thing doesn't matter. Time to move on past it & get dirty building the car.