First I match the payment sheets (paypal or credit card) with the quote page, then match up the shipping paperwork.
In the couple of years we've been doing this, we've had one cancellation, back in October. The guy couldn't wait any longer. Brian took his name off of the board and I refunded his money.
So, I'm matching up the shipping paperwork, right? Brian shipped out the cancelled order the following week.
I call the guy. "Hey, this is Dianne and I refunded your money at the end of October. But the work order never got pulled, so your unit was shipped out the following week."
He said he'd pay, he's been using it. Probably has to double check to make sure I'm not lying. I sent him another quote.
*sigh*