Their is no way to prove that.
Can't prove it but I did a google search on Marcus Crassus' net worth and this is what I found:
1. Marcus Licinius Crassus (115 BC 53 BC)
Net Worth: $2 Trillion
How He Made His Fortune: Proscriptions, slave trafficking, judicious purchases of land and houses, purchases of burning property.
About: Marcus Licinius Crassus was a Roman general and politician. Although he initially began with a rather large inheritance, he lost all of it during the Marian-Cinnan proscriptions, in which he was forced to flee to Hispania. However, Crassus would get his revenge while commanding the left wing of Sullas army, making a fortune from proscriptions himself.
Proscriptions were only part of his overall wealth. It is said that after receiving word of houses being on fire, Crassus would arrive with an army of 500 firefighters and attempt to offer a modest sum for the property. If the offer was refused, Crassus would let the property burn to the ground.
Crassus went on to seek political power and struggled throughout most of his career. His fortune, however, played a large part in gaining support from senators. He was eventually elected censor and helped finance Julius Caesars successful campaign to become Pontifex Maximus.
Known For: Suppressing the slave revolt led by Spartacus.
Fun Fact: After Crassus death, a story later surfaced that the Parthians poured molten gold into Crassus mouth as punishment for his greed.