Recently I bought a couple boxes of Marx equipment. The seller I bought them from threw in a couple cheap plastic cars that are kind of mysterious to me. These cars are all plastic, including the wheels and axles. No numbers or identification that I can see. The seller said they were built in Mexico, but I can't find any info about them online. They feature the Marx-style fixed knuckle couplers. I'm unsure if these are actual Marx products or some sort of knock off. The caboose looks identical to the plastic 4-wheel 18326 Marx cabooses, except the circles where the Marx logo would be molded in are smooth.
Any ideas?