1) Can't accept a cash deposit of that amount? That's just not true. Many cash based businesses make deposits of that amount every week. A lot of trucks and cars are bought in cash. Many large Vegas winnings are paid out in cash. When you receive big cash, you make the deposit. The only requirement is that those deposits of more than $5K must be reported.
2) Suspicious doesn't mean the government gets to take the money. It means the government may investigate.