dustpuppy: I found it in my atrium, in the decoration bar, but I'm sure blobber is right, that your decoration items will appear as soon as you get your first location.
Meanwhile, I've encountered another interesting glitch. After I found my 15th egg, the post pixie called again, but when I clicked on the parcel, I was redirected to a white screen. Maybe that's somehow connected to the problem Exterminans mentioned? (Er, I wanted to attach a screenshot, but I don't remember how to do this...)
Anyway, the egg hunt was fun, thanks a lot!