Yes, the Bonaparte's had access and possession of vast wealth. Per example; we all know the story behind Joseph's plundering of the Spanish Crown and a return trip he ordered into Switzerland to retrieve an assortment of valuables hidden there. Armies didn't move without a treasury and to the victor go the spoils. Research many of the paintings he had at his estate and where they came from and how he acquired them. There is also one document discussing sending a portion of the treasury to the United States prior to Bonaparte's expected escape to this country.
One other point of interest; you might also research the first know discoveries of "jewels" in this country, not very likely that those mentioned in the Beale Pamphlet came from the US. Keep in mind as well that it would have been nearly impossible to attach any type of an exact value to uncut stones. During the period in question "jewels" mainly consisted of cut and polished,
diamond,
ruby,
sapphire and
emerald, which is a very specialized craft.