In that case, every sub component on the OEM cable is UL. I wonder if that's the case for the Amazon and eBay offerings. Was the one you tested marked?
That may be true of power supplies meant to go inside other products, but it’s not true of EV charging cables, which should be listed to UL 2594, Standard for Electric Vehicle Supply Equipment. It may be easier to get such a listing if the connector is a UL recognized component, but the entire assembly should be listed. As @jb in NE kindly points out, the Toyota cables have a UL listing mark, seen in photos in this thread.
One additional feature of the OEM cable - the cord is very flexible in cold weather. That takes a high quality jacket. I would be interested to see how flexible the alternative cables are - less cost generally means they skimp on jacket quality.
The one I tested with the white charge handle pictured in post #5 (costing me $20 to ship it back) says FC, CE, and in very small print what looks like TUV. One interesting thing to note, the main body of the China built EVSE unit is extremely light & hollow feeling. I'd say that the Toyota EVSE unit weighs at least twice as much. Rob43
If it is of any interest this video explains a little on what it takes for a Charging station unit to get a UL listing, why it may be important to an individual and why some companies do not bother with obtaining a UL listing: link to video ClipperCreek Goes Through Time, Expense for Safety
Of interest in that video, they recommend no 240 plugs without earth grounds (i.e. 10-30 or 10-50), as these can't be certified under existing standards.