You are lucky to get your bike back after all this time, and to still have it in good condition is just jammy!
My bike got nicked almost three years ago (done up full susser, before i started trials) and i didnt hear anything at all, i went to the cop station a few minutes after it happened and put in a report, put posters up, rung round etc but no luck. It has happened to half the people on here as it seems... :huh: