As I think BeenBurned mentioned, the creed details on the fakes are usually frighteningly close to the real ones but there are always a few tiny mistakes. I don't have pics of that exact bag but I have some creed pics of the genuine 10125 which is a different size version of the same bag, so I'm posting them for comparison below. The spacing of the serial prefixes is slightly different but the tiny details in the creed letters seem ok.
Based on the creeds and the color of the brass Legacy charm my feeling is that it's probably genuine.