I need to know what you think of this.... Is it something my father can get in trouble for?

In the early 60's my father did some work for U of MD in Pakistan in a back providence that was just reseach on some deseases. While there he helped out an old man on the street who turned out to be a good friend of the local Prince. The Prince invited my Dad up to his home Inot quit a polace) and gave him and his other scientist dinner to express his thanks. The Prince decided he really liked my Dad and gave him a little statue that my Dad thought had been made by a local craftsman. Years later he had an arceologist friend tell him it was a small head of Julius Ceasur and looked to be about 2000 yrs old. I know you are not supposed to take such things out of other countries but will this be the same thing were the ruler of the area gave it to him as a gift? Not taking it would have been a very bad thing as this Prince had a reputation for being very fickil.