Bury it in the back yard in the flower bed or under the dog house.
A home safe.
Under a floor board.
Out at his weekend home.
In a Swiss bank.
Launder it so it’s harder to trace.
Ease it into his normal spending with a new car here and a vacation there but nothing too flashy to draw attention.
I agree with the laundering. I would have endeavored to turn quite a bit of it into gold coins, platinum bars...something.