Casinos do try to keep track of ratholers. In this example I don't even consider it ratholing. I just put it in my pocket and changed games for less.
Last week at Beau in MS. I played some DD and was down $100. Left the table and went to Craps. I bought in for $200 at one table and my wife bought in on the next table over. After about an hour, I colored in for $375. I put one black chip in my pocket and went to join my wife on the other table. I gave them my players card and 2 black chips, and put the $75 in chips in my rack. The box man and dealer gave me my red and green change and the boxman said, "and you still have the other black in your pocket, right?" I don't think he actually new it was in my pocket, but when he swiped my card, he saw I just cashed out for $375 and only bought in for $275. They do pay attention and keep track of the black chips, even just one!
Last week at Beau in MS. I played some DD and was down $100. Left the table and went to Craps. I bought in for $200 at one table and my wife bought in on the next table over. After about an hour, I colored in for $375. I put one black chip in my pocket and went to join my wife on the other table. I gave them my players card and 2 black chips, and put the $75 in chips in my rack. The box man and dealer gave me my red and green change and the boxman said, "and you still have the other black in your pocket, right?" I don't think he actually new it was in my pocket, but when he swiped my card, he saw I just cashed out for $375 and only bought in for $275. They do pay attention and keep track of the black chips, even just one!