Mr Uberti's former secretary told an Argentine judge last month that she saw Mr Antonini at a reception at the presidential palace two days after the cash was discovered.
Claudio Uberti is an Argentinean and the director of a government agency that since November, 2003 controls all freeway concessions (OCCOVI) and is in charge of collecting the fees on every toll booth of every road, highway and bridge in the country.