@Solemmaru The drug dealer will skip town while the other two will get thrown under the bus by their companies, or their companies will try to make it go away. Now, as for how much jail time they could get, well that's hard to answer because they are in different countries. In the U.S., you can get up to 20 years while in the UK, you can get up to 14 years.
If the drug lord is buying all the paintings, Mau doesn't need the insurance or the vault... (since the larger vault and extra insurance was due to her increased inventory)