1. At a receipt application server for a merchant, the receipt application server including one or more processors and system memory, the receipt application server connected to one or more Point-Of-Sale (POS) systems and one or more auditor mobile devices at each of one or more store locations for the merchant, the receipt application server configured to manage a receipt database for the merchant, a method for locating digital receipt data for use in an in-store audit, the method comprising: receiving digital receipt data for a sales transaction conducted at a Point-Of-Sale (POS) system, the Point-Of-Sale (POS) system in a store location selected from among the one or more store locations, the digital receipt data containing a receipt entry for each of one or more items purchased by a customer in the sales transaction; generating a digital receipt for the sales transaction, the digital receipt generated from the digital receipt data, the digital receipt containing the receipt entry for each of the one or more purchased items, the digital receipt providing proof of the sales transaction, the digital receipt for delivery to a customer mobile device associated with the customer; receiving an indication that the sales transaction is to be audited in the store location; and sending the digital receipt to an auditor mobile device at the store location, the auditor mobile device for use in auditing receipt entries contained in the digital receipt against items physical possessed by the customer upon the customer attempting to exit the store location, the auditor mobile device used to reorder receipt entries in accordance with audit rules, the audit rules defining an audit priority for each of the one or more purchased items based on characteristics of each of the one or more purchased items, an audit priority for a purchased item indicating an importance of expressly auditing the purchased item at the store location, the reordered entries displayable during audits at the store location to increase the likelihood of expressly auditing purchased items with higher indicated importance.