If it hasn't been received recently, don't bother your receiver. MyWork is accurate about dates. The ony exception is if the DC accidentally tossed another store's box on your store's truck. That does happen, but not often enough to worry about.
Your store likely has a casepack that was not properly located in the back. Auditing that out is fine. If someone finds the casepaclk, the counts can be corrected.
This is also why guest services should not be in charge of OPU. A GM TL would have told you to just audit and move on. If you don't have it, you don't have it.