Invoice Location vs. Shipping Location

I need to create a report that shows me all the invoices for a given period that have a location that is different from the location the items were shipped from.  We call them "ship and bill" orders.  Here is the scenario spelled out as simply as I can think of it:

1. Order is placed in location X.
2. Item is located in location Y, so location Y is chosen as the location on the line level, NOT the header level.
3. Item ships from location Y.
4. Invoice is created with location X in the header.

I need to identify all of these transactions in a saved search.  I've tried using the location from the fulfilling/receiving transaction fields, but it does not work.  I don't see a way to pick the location of a line as an option, only the header location.