+1 to BlackljackFeign. Very well written.

Although I am largely retired I have travelled between
the USA and several other countries, Canada included.

I purposely withdraw a high 5 figure sum from my F.C.U.
Regular C.T.R/'s are a good thing my skeptical friends!
I carry the receipt with me, on my person. Every time
that I have had a T.S.A. minion or Customs Agent ask
me why I have so much cash, I say I plan on 'gambling
to excess' (L.O.L.) and show my bank receipt which even
indicates the distribution of bills. The receipt is exculpatory
evidence (to anyone) that there isn't any 'ill-gotten gain'.

Once I had a middle 5 figure sum in cash, and an additional 5
figure sum in casino chips. That made the T.S.A. fellow curious
but he quickly realized that they needed to return it all to me.