I've also seen nestie babies sold in France (spotted them in lots, etc). But I can't confirm this, because I have never seen a nestie baby in french packaging.
Just so you know. The seller is known for her MOC/MIB pony auctions. She has sold MOC/MIB ponies from allover the world! I've seen her auction off a MOC baby honeycomb, Sunshine pony in dutch/belgium packaging, show 'n glow pony in spanish packaging, etc. So a very wide range of MOC/MIB ponies.
It might indeed be that this MIB one is from another county and not Germany. Scandinavia is a good guess, all pony sold there were on english card. Also Australia, because of the english language.
BUT, this is a long shot, could they also be sold in the UK for a very limited amount of time? Has anyone bough a nestie baby off the UK market?