The chips in the pictures appear to be generic chips, however that doesn't mean they might not have been at the MGM. Perhaps they had them for training/practice uses. Of course that being said I would not ascribe any higher value to them because someone (even if I believe them) says they were at the MGM at the time of the fire. Why? because they are generic chips and there is no way to distinguish these chips from the other generic chips of the same design.

Though my collection of Saratoga illegals contains some generic chips purported to have been used in an Illegal casino, they are in my colelction as a matter of personal interest. I know that value wise I can not distinguish these chips as being any different than generic chips of the same design that exist among the piles and piles of generic chips.