Shared Address Book Deleted Admin Message

[sinnwellr]

We have a few users who get a message each weekend when we run our Contents check about a shared address book that is from a user that we deleted almost a year ago. Here are the details of the message:

From: Admin GWCheck
Subject: Shared Address Book Delete Notification
Body:
The shared address book "XYZ (FirstName LastName)" has been deleted because the sender "Domain:PostOffice:UserID" is no longer valid.

I have looked in the Address Books of the users getting the message and they no longer have the books that were originated by this person (checked Online and Caching modes).

Any ideas of what we can do to figure this one out? It has me stumped!