Razer Mamba Wireless Bluetooth USB Holder

I recently bought the Razer Mamba Wireless: Gears of War Edition mouse. However, about 2 weeks after buying, I lost its small, semi-transparent Bluetooth USB case. So not a big problem right? Just keep the USB close by? Nope, it makes gaming and overall usage much worse. There's this little rasp type of thing, like a crumb on it that won't come off. I have tried cleaning it about 4 times, and no change. I think it's the fact that I am missing the Bluetooth USB holder, so for the sake of my sanity does anyone know if I can buy a new Bluetooth USB Holder or whatever its called?