This interested me so i asked on XE and wilhelm said
QUOTE
I think its just an M$ prototype in fact they do tests on retail consoles all the time I have also already had one like that mostly they got "DEV <blabla>" written on the labels.
No big deal really they just couldnt be bothered to remove the debug ports and left them installed...
That makes sense and he is like an xbox master so i beleive him