Really not significant enough to be included in a North African campaign book, except as a curiosity for German "tourists".
From an article on 6 RTR in an old issue of AFV News. A burned-out Medium Mk.II being inspected by DAK troops. This is likely a former 6 RTR machine. Shortly after Italy declared war, 6 RTR was ordered to send 3 of its Vickers Mediums to Siwa Oasis for use as static defence there. One of them caught fire en route and the completely burned out wreck was abandoned along the Mersa Matruh - Siwa track. Most of the remaining Mediums were built into the Mersa Matruh defences as pillboxes.
The wreck was likely still there when the German 'tourists' arrived the following year.