These photographs of Border Jeeps come from a Septmeber 1949 article in Mechanix Magazine. You can read the entire article here.
In this picture you can clearly see this is a CJ-2A. It didn’t take them long to customize the bumper.
The first image below appears to show a MB. I’m a little surprised it doesn’t have a top for shade like the other border jeeps I’ve seen. The second picture is likely a CJ-2A based on the bas tank inlet.