It's also possible that those particular keys are attached to a different input device than the normal keyboard. Easiest is probably just to try input0, input1, and so on (until you get a "No such file or directory"), and check whether they appear on any of those.
It's also possible that those particular keys are attached to a different input device than the normal keyboard. Easiest is probably just to try input0, input1, and so on (until you get a "No such file or directory"), and check whether they appear on any of those.