Michael (from Weston) just informed me of same problem. They will fix them in Australia, and will use them for Mac store demonstration units, instead of selling them to customers.
I gave Weston a credit for all 20 keyboards (5 FK418BTS, 5 FK418BTB, 5 FK418BTG, 5 FK418BTRG). They will reduce payment on next order. You can update your records.