Is it that hard to prove where 80k of cash came from? Either you were paid in cash for a job, and you’ll have paperwork for that. Or you sold something expensive, and you’ll have proof of that too. Or you won it at a casino? I’m sure they can give you proof as wel
Note that in most countries if you cannot prove where you got your money you will be in trouble, and it could be higher than just seizing your assets. The difference is that the money usually goes to the state, not the police department. But travel in most European countries with 50 000€ in cash without declaring it and you will have troubles