My research into the Iltis has established that there were actually 9 'pre-series' VW Iltis provided to the CF. I have attached a photograph of a VW Iltis Light Ambulance in Canadian Service that I photographed outside of Cobden, Ontario in 1987.
You will need the Iltis MG mount trials report document to establish the actual date of the trials although it would have had to have been conducted prior to 1988; as this is when the last of the 'pre-series' VW Iltis in the 46411 to 46414 CFR range were disposed of.