Here is the Apple Document:
http://support.apple.com/kb/HT6302
and according to our SE most are fixed going back three years.
In your DEP portal you can pull down a spreadsheet of ALL your devices, and at the bottom it will show you the replacements, orders starting with R-
to find this:
In the Apple DEP portal, In the left column choose Assign by Order number
In the order number blank, type in a 1, and then a list will pop up:Choose: All Available>Download CSV, and scroll to the bottom to find your replacement orders.
I just ran into one that won't go in, but if we are going back three years, I know there are random purchases from Target and Best Buy so I guess I'm setting these aside for now... or maybe it's one that is not fixed YET, as Apple admits they are still working on this
Sandy