Well, The Art of Disney wasn't represented in the Magic Kingdom, so VMK Central was the logical location, I guess.
Word to the wise about the VMK "mystery" boxed pin sets. People have been breaking into the boxes and stealing the pins. Because this pin set is NON-REFUNDABLE (even with a receipt), I have a suggestion:
Tell the cast member at the register that you want him/her to witness you confirming that the pins are still in the box as you purchase them. If the pins are missing, the cast member should allow you to get a replacement.