All the H967's I've seen had non-ace keys for
the back doors. Most
(if not all, can't remember) of my H960's use non-ace keys for the
back doors.
I believe the common back door key is a National C415A. Cut 12343 b-t
on an Ilco 1069N blank. These are also used in electrical panels, so
are trivially available on eBay and such.
Haven't managed to id the 11/05 key yet.
De