The sticker can be removed without any issues. Just make sure you keep it in a safe place as it will need to be returned with the card for warranty service.

Scarlet-Tech
I use a tiny drop of superglue or small piece of double sided tape if it starts to come off. They understand :-)

Also, like Sajin said, you can easily take it off and store it somewhere safe in case you need it.

Hello Scarlet-Tech,
 
Please do not use any adhesive.  This voids warranty. 
 

huitin
My serial number sticker is nearly falling off, is there anyway it can be retaped?
 
Item is still under warranty, about 2 year and 5 month left.  Don't want to lose the warranty on the item.

Hello huitin,
 
If the serial number has accidentally fallen off from the product, please simply hold on to it as we do require the serial number to be included with any return for warranty services.
 
Regards,

Can the warranty sticker be purposely removed and stored in the box?  It simply ruins the look of that wonderful back plate.

MaXKiLLz
Can the warranty sticker be purposely removed and stored in the box?  It simply ruins the look of that wonderful back plate.

Yes, as long as you don't damage it while removing it. If you mess up the sticker while removing it you will be sol.