I really opened my coin capsule, and I had 100 coins. After that I bought it and it said something like "You received/bought a shiny Ninetales mount" (I don't know the exact wording) and then I clicked the "okay"-Button. No it is not in my mount inventory, a few minutes before I bought a jet ski and everything worked perfectly. My coins are gone, there is also no item and no coin capsule as well. It just disappeared completely! :(