Earlier on in the year, the '2' key of my DiNovo Edge keyboard popped off - quite an expensive keyboard, which I use for my HTPC. Anyhoo, the keyboard was a couple of years old, and I'd long since lost the receipt. So I contacted Logitech and explained the situation - long story short, they asked me to send pictures of the keyboard with a number written on some paper visible in the shot. I supplied this, then they asked me to supply another set of photos, with the same number, but with the keyboard in an 'unusable state' I actually had to physically destroy the keyboard (the email from them said 'please do not harm yourself when performing this procedure') They did send me an entirely new boxed keyboard though