He has more then 10,000$ cash to declare and he doesn't want to take the risk of carrying hard currency. So he is planning on buying a watch with the money and then selling it for the cash when back home.
As far as I remember you are allowed to bring more then 10,000$ but you just have to declare it. Why not just do the easy/honest thing?
Never the less I can think of quite a few things more liquid than a watch to do this with....
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