Many auditors sort and work their queue of invoices based on which payments are due the soonest. This is calculated by invoice received date + Payment Terms.
This is a more valuable field to have on the Audit Queue than Ship Date, as users can sort the payments due the soonest to the top.
This can also help with Quick Pay invoices as their due dates would be sooner and would flow to the top.
The idea is to calculate the Due Date, and to show this Due Date in the Audit Invoice queue, allowing users to sort/filter by it.