well if u got a softmod you can remove it completely but if you got a modchip (you can still remove unleashx completely) but the chip will obviously still be there and i dont think ebay allows selling moded xboxs (im assuming your selling it on ebay)... so basically you will get less cash cause of that.... since u wont be able to say it has a modchip which sucks

lol
either way i dont think you really have to "hide" anything just sell it like it is since it still acts like a normall xbox... just dont say it's moded on ebay when you sell it... and i highly doubt anyone will complain if they see it's moded.... just be sure to remove ALL games and emulators etc so it's all legal

... just leave the UnleashX dashboard on it and the rest of it stock.