Assuming the govt took the money under the auspices of a criminal forfeiture (which I assume because the company was supposedly for money laundering), you would basically need to prove a paper trail to show what specific part of the money they seized was yours, and even then who knows if there isn't a loophole that allows them to basically not respond if the forfeiture was of a foreign company on foreign soil. They took it from a non-US entity, so they may not have any responsibility to give any of it back, because it was not being held by someone in the US [with rights in the US].

(note: IANAL)