Some of the pieces have been sold on eBay so often that they've probably spent a good bit of their lives in the mail. I've seen some things so many times. I often wonder how many times something can be shipped without having its luck run out.
It may be related -- about half the things I've bought off eBay lately have had damage or repairs.
I do want to say that some of the earlier animals do have abrupt endings to some of their appendages (though usually not wings). The shaping of tails, trunks, feet, etc., was not as careful in the early days. Often they were just snipped, sometimes along a long line that left a scar. I don't see this snip and leave technique much in post-1960 animals, except for the occasional tail. When something is snipped, people get uncomfortable that it is actually chipped.
In the case of Paul's duck, it would have taken extra work to do the polishing on the wings. I don't think a glassmaker would have done it because it detracts from the appearance of the bird. So, like Rosie said, I think our little duck has been grounded and will never again have sings to soar. You'll have to set it on a special shelf, Paul.