Key at Bottom of HBP Promo Stand

[Megan]

No: HPFGUIDX 127109


Looking around on various Harry Potter fan sites that I happen 
to frequent periodically, I happened to notice a new posting on 
Mugglenet.Com (great site for those who have never been) and 
someone spotted a KEY at the bottom of the promo stand. (Go to 
the following link to see)

http://www.mugglenet.com/viewer/?image_location=/hbpkey.jpg

Could this key, as MuggleNet suggests, be a hint to the HBP or 
just a random oddity?

What does everyone think?

Here is a suggestion of mine...

I know there has been talk of who gets Sirius' gold and house and 
stuff since he is no more (Megan wipes away tears while typing 
this). Maybe this is the key to Sirius' Gringotts Vault. 

OR, could this be a key to wherever Lily and James' things are 
being stored? Harry is coming to slowly gather more and more information on his parents and the people they were. Harry 
inherits things of his father's periodically, or a gift of use by 
SOMEONE. I cannot remember if it is each year, but I know he got 
the Invisibility Cloak in SS/PS, CoS: ???, PoA: Maurader's Map, 
GoF: Sirus's Knife, OotP: the 2-Way Mirror (though he didn't use 
it really). 

I have a feeling, though I could be dead wrong, that it has 
SOMETHING to do with the book. It was way at the bottom though, 
and might be a "Trademark Symbol" of Border's Books, or Scolastic Books. 

Whatcha all think??? I'd love to hear the speculation. :-D

*Megan goes back to her "periodic" visits to other fan sites for 
more useless info*