As a funny counter, I recently traveled through 6 TSA checkpoints with a loaded magazine in my bag. I had it from when I was at my farm, oops. Was a little concerned because I was in Boston when they found it (I’m based out of Tennessee). But they let me go and confiscated it.
Point being, if they can’t find a loaded magazine, I doubt they’d be able to find money intentionally. Then again, might have more incentive to find the money