I've just been checking that I can open my door with the "hidden" key and note that there are a couple of what look like codes on the clip that holds the key in the fob. They're of the form XXNN-NNXNNN-XX and NXXXNNNNN where X is a letter and N a number.

Is this by any chance a key code for if I lose it? Ian.
2013 LR2 SD4 XS
1982 Moto Guzzi V50
1952 Norton ES2