Light scratches on the back.

[Temp74]

hi, new owner with the ipad 2 and new on here, bought my boy the ipad, great gadget and from new i put a screen protector as well as a back protector but some how it has got 3 very light scratches one the back. is there any thing or any way to repair them, i thought about one of them silver pens but didnt want to try untill i ask here.
thanks daveo