Laundering money isn't easy without losing a substantial amount which is why the majority of those caught keep it in a safe. A lot of us knew Mash from Tailormade Circuits, £250,000 in cash was found at his home with a similar amount found in various bank accounts.
Another guy some of us knew (shall remain nameless) hid £80,000 in a safe in his loft.
Would be a nice problem to have but hiding/disposing of money isn't easy.