While I agree with you there is something suspicion going on here, I have to say that any businessman that refuses a cash sale, regardless of the product, should not be in business.
So Ahmed, Abdul and Vaheed offer you a garbage bag full of cash for an agricultural helicopter that disperses pesticides; you sell no questions asked?
You'll be in the Fortune 500 in no time at all...
It is not enough for there to be suspicion of illegal activity for a forfeiture. It must be traceable to an offense that allows forfeiture, such as drug crimes.
I think there were probably some immigration issues going on here, accounting for being able to amass funds in cash rather than accounts. And an immigration violation does not give rise to forfeiture.