I guess these remain unknown. I do not know if this is significant but these were found along with a small cache (8 or 9) of purple $5 TMc diamond mold chips attributed to the Golden Nugget. Unfortunately, the Nugget chips are badly sun damaged as they appear to have spent some time in an outside flea market or such.

I thought maybe these RHLs didn't travel far and might have come from some well known illegal joint in the Vegas, Reno, New Mexico area around the late 40s early 50s. There was also a CCC chain mold chip along for the ride if I am not mistaken.