Oh yeah. I’ve carried over $10k several times but I always had a paper trail to back it up.
And I've carried just under $10k for transactions but nervously looked over my shoulder, not for thieves but for government DEA jerks intent on stealing citizens' money. A paper trail won't save you, because you'll lose in lawyer's fees and loss of money while fighting to get it back. Ordinary citizens are victimized while Mexican drug lords get away with murder (literally).