Why would you want to know?
MTF is a guide at best.. I also have a 40D, secondhand and I've taken the file counter round the clock a few times myself in the last couple oif years.. knowing the shuttercount won't improve my photography, the only effects of knowing the camera was approaching MTF I can think of are either subconsciosly causing me to ration my shots or callously thinking of selling it on to someone else. All in all, it seems a pointless exercise unless you like worrying about things.
The 40D is a crackin' camera, just get out and use it.