Ah! I guess they really were just for the day. Pity, but wouldn't it be cool if they did more limited edition Ducks.
You're right that the second picture mentions that they were handed out on the plane, but the third pic (
http://instagram.com/p/ino0WMiwuL/) looks like the lounge or FCT in the back.
Since thats the one thats wrapped, I figured they handed them at the FCT and the opened ones are pictured on the plane..
By the way, I'm not sure where the ducks have been, but MUC didn't have any a week ago. The lady mentioned they won't have them anymore.
At the FCT last week as well, they said they didn't have any on that day, so I didn't get a single one this trip.