Where can I walk in with 29,0000 bitcoin x market value and walk out with suitcases full of $100 bills? I wonder if there is any legal implications of the fede

Where can I walk in with 29,0000 bitcoin x market value and walk out with suitcases full of $100 bills? I wonder if there is any legal implications of the federal government selling Bitcoin. I always felt the majority of bitcoins were mined illegially(on company, and university mainframes--without consent). I'm surprised they are asking for a deposit in cash?