I think it's thoughtful of you queen of hearts to get some luck tokens for your parents, whether they believe in them or not.
Besides, they will be told "Good Luck" everywhere they go in Las Vegas, by the dealers and even by the hotel check-in personel.
I really don't like it when everyone who works at the casinos have to tell you good luck.
My general response is; yeah thanks...
When it should be; hey, good luck to you too, because I'm going to work hard on taking all the money I can from your casino.
Anyways, they won't need good luck charms. All the casino workers in Las Vegas will be wishing them good luck.