If your "tesoro" is the result of income, you've filed your taxes, claimed your foreign tax credit, and filed your FBARs, then you should have no problems with the IRS.
One thing that hasn't been discussed much on BAExpats is FATCA:
http://www.irs.gov/Businesses/Corporations/Foreign-Account-Tax-Compliance-Act-FATCA
Our friendly AFIP of the North is becoming more and more interested in the behavior of its citizens outside its borders. Here are two articles describing the predicament:
http://www.forbes.com/sites/robertwood/2013/06/25/will-irs-find-your-small-foreign-bank-account/
http://www.forbes.com/sites/robertwood/2012/10/26/should-u-s-citizens-abroad-pick-streamlined-irs-program-or-ovdp/
FACTA is the reason I am living in Austin and not Montevideo. The company was not able to directly open a payroll account for me because most UR banks don't want to deal with the reporting requirements caused by US Citizens.