Bosnia is certainly not one's only choice for hiding money. There is a large industry of offshore banking. However, transfers leaving the country are reported to the Feds . I don't remember what the threshold amount is, but it's on the same order of magnitude as the $10K cash threshold. This is all of course only about the US, but other countries have similar requirements.

There used to be a scam where you could have your income wired to a semi-anonymous offshore account, and then use a debit/ATM card linked to that account to spend the money tax-free. The IRS has gone after those people, so that scam is basically gone.