i just purchased 10 of these (from overseas but they are genuine Made in America which match exactly to 3 i've had for years).
none of them will come up (in a 3548) but the 3 i've had come up immediately.
i don't get it
Any messages in the log? If you're not monitoring, those can slip by. I would expect some form of "unrecognized interface type" message if IOS is unhappy.
Also see if inserting them while the switch is powered down (if you can).