I picked up the same dice. I believe you got them from Bruce.
When I got them, I looked for a couple of days scouring the internet for clues. I did find a card room with the Caballero name...but I have put all of my notes( yes..all of them) away. I can't remember what town I found the card room in, but I keep thinking Oxnard for some reason. ( Of course, there is a great chance I'm mistaken. This is not a positive ID...I am going off a jumbled memory. I don't have access to my notes😩