Mikeyt the mattress is not the best place to keep it --- it's the first place everyone always looks. The mattress gets kind of lumpy after a while with all those piles of cash stuffed in it. I am told putting it in an old coffee can and then burying it in the back yard works well. At least it works well until you forget where you buried it. But there is always the bank (or in this case likely a series of banks). I suppose this is just another one of those problems one will need to face once that money comes flooding in.