I have found that in sets, too. The way this is handled in inventories is that
the full quantity of the parts in question are listed in the inventory as alternates.
My suggestion is to resubmit your request as follows:
* Add 4 Part 4865 Black Panel 1 x 2 x 1 (Alternate)
You'll also need to connect the regular parts to the alternate parts with
a Match ID, which for this set would be 2.
Please make changes to the following inventory: (Set 76056-1) * Add 1 Part 4865 Black Panel 1 x 2 x 1 (Counterpart) (81 months ago, Oct 17, 2017, to Inventories Requests)
I guess I wasn't paying enough attention when I filled that out! They were actually ALL square corners in 5 boxes worth. In Inventories Requests, StormChaser writes: [...] (81 months ago, Oct 18, 2017, to Inventories Requests)