Even if the driver is incorrect a USB device should show up as "something". ("Composite Device" seems to be the default. I've just tried an unknown-to-OS X Belkin serial adapter and that's what it's called, same as the missile launcher.) The bus interface circuitry will be active even if the bluetooth functionality isn't initialized.

This command:

Will display *everything* the Mac detects on the USB bus. I'd suggest unplugging the module, running this and saving the output, plugging the module back in, and seeing if there is any difference. If it's there it should show the product and vendor id.