Please don't use a cashbox! I have seen the money stolen twice, and both times, the vendor was in tears. We took up a collection to get them some of their money back. The safest thing to do is keep your paper money, and credit card forms on you, in a money apron, in order, by denomination, or small purse that straps around your waist, and keep loose change in a bowl. It's much safer! One trick they use that I've mentioned before, is the adult occupies you while their child goes under the tablecloth, where the cashbox is!