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Do cash exchange in Dubai report to your home country?

No, they don't. They keep a record of it in case the Dubai authorities ever have a reason to look into you. But there is no automatic reporting to your home country.
That's nice. Only problem is that it is difficult to leave Dubai without an airplane, which means you have to go through customs, which in turn limits you to a maximum of 10K euros.
 
That's nice. Only problem is that it is difficult to leave Dubai without an airplane, which means you have to go through customs, which in turn limits you to a maximum of 10K euros.
Depends on where you fly in from. The official limit is 60,000 AED in UAE, which is around 15,000 EUR at the moment. But as recent news have shown, it's easy to bring in millions with the right connections. Look into Al Jazeera's reports on the "gold mafia" that came out earlier this year.