More than $11m is missing from The Gambia's state coffers following the departure of long-time leader Yahya Jammeh, an adviser to President Adama Barrow has said.
Mai Ahmad Fatty said financial experts were trying to evaluate the exact loss.
Luxury cars and other items were reportedly loaded on to a Chadian cargo plane as Mr Jammeh left the country.
After 22 years in power, Mr Jammeh flew into exile on Saturday.
He had refused to accept election results but finally left after mediation by regional leaders and the threat of military intervention.
President Barrow remains in neighboring Senegal and it is not clear when he will return, informs BBC.
However, West African troops entered the Gambian capital, Banjul, on Sunday to prepare for his arrival.
Cheering crowds gathered outside the State House to watch soldiers secure the building.
Mr Fatty said officials at The Gambia's main airport had been told not to let any of Mr Jammeh's belongings leave the country.
Reports said some of the former leader's goods were in Guinea where Mr Jammeh had stopped on his journey into exile.
Mr Jammeh is reported to now be in Equatorial Guinea, although authorities there have not confirmed it.