What is "cash boxes"

Usage examples of "cash boxes".

Inside, filling one end and nestling next to joints of lamb and boxes of beefburgers, was a stack of three large grey metal cash boxes, each one closely wrapped in transparent polythene sheeting.

So after emptying one of the cash boxes, I split, and went and talked to the hairy man myself.

A merchant had died, and his grown son had accused his stepmother of appropriating money that, according to the accounts, should have been there in his cash boxes.

The Truth Spell had revealed that the stepmother was not guilty of helping herself to the money stowed in the cash boxes, but where had the money gone?