Hugo shared a French documentary about Uruguay that includes a CJ-3A. Below is a still from the video (full video here). The jeep only makes a couple second appearance.
“At the 3:20 mark, this video shows our central and most important avenue. The date of the video is 18 de Julio (18th July), the day our first constitution was approved. The location along the avenue is still possible to recognize by the architecture. Obviouslly everything else changed.
The Willys is pulling an advertisement for the Lottery of the 6th January day of the Three Kings. It is an important hollyday in Uruguay. Today it is comparable to Christmas, regarding the weight of gifts for children.”
On a side note, while doing some brief research for this, I learned that Uruguay has the longest carnival season in the world, as it runs 40 days each year!