On saturday, at the end of the event, two people should have counted the money, then put it in an envelope and sealed it. Both counters sign the back of the envelope, then one of them should be going to the bank today. Or could have done a bank drop on saturday. Driving around with an unsecured cash box, taking it out, counting, recounting is asking for trouble. And apparently they found it. Or someone made a mistake in the counting. If it was me, I wouldn't coughing up any money for the missing money.