I don't think they care how much you bring in as peso there are declaration limits such as 10,000 dollars equivalent where you must declare to customs on the way in but the 10,000 peso limit is on what you take out the country![]()
That's why you should never change it all in one go as that way you have to spend it all until you have 10,000 peso leftsometimes I've actually come home with UK money in my pocket
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Not often though
Jim