You don't necessarily need to open it. If my assumption of the SD Card containing a serial number incl the manufacturing date is true, try doing
Quote:
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# busybox head -C 256 /dev/mmcblk0 | busybox hexdump -C
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on a telnet prompt on your kobo. That should dump the Serial number. As I said I suspect the part after the SNr to be the manufacturing date.
Mine is definetely a "new" Kobo (as in 'requiring Glo Firmware') and is a N905C.