Hello Hanno,
Pictures of Otters in Italian service are extremely rare to find. One or two photos of these armoured cars can be find in this book: "Gli Autoveicoli da combattimento dell'Esercito Italiano" Vol.III: 1945-1955. Pignato,Nicola. Cappellano,Filippo. Editore: Stato Maggiore dell'Esercito, Roma, (2007).
The authors state that Otters and, to a greater extent, C15TA armoured trucks, were delivered to some Italian units immediately after the war.
My focus is exclusively on WW2. During my research on Italian Co-belligerent Army I found that Otters were employed by the Partisan Brigade "Maiella" and (but I haven't found any clear photos related to this particular matter) by Artillery Regiments and HQ Companies of the Combat Groups.
Here are three interesting pictures:
The first is an Otter of "Maiella" Brigade. The emblem of the unit is visible on this vehicle: the white silhouette of the Maiella mountain massif, located in the Abruzzi region of Central Italy, on a circular light blue background. This marking is the same as the one reproduced on the shoulder patch sewn on the battledress worn by partisans of the brigade.
I'm not able to attach other files at the moment for copyright reasons related to the publication of my book. As soon as it goes on sale I will try to post other pictures.
...but i have two other images regarding C15TAs in service with Italian Army in 1947. These armoured trucks of the 114th Infantry Regiment, Mantova Division, were photographed on 14 September 1947, when the city of Gorizia returned to Italy.
Hope my English is understable, I'm alwais afraid of mistakes
Regards,
Luigi