reference needed

[Henri Kunne]

At 12:03 25-1-01, Nils wrote:

>The inhabitants of Duckburg generally have four fingers
>(unless stress situations cause them to develop spontaneous
>polydactylism, as can be seen in a couple of even Barks
>stories, where Donald on a couple of occasions can be seen
>having five fingers).

Guess I'm a poor onlooker, but I cannot rememer even having
seen such a thing in a Barks story! Can't you give examples?
I want to look them up, I'm fond of this kind of curios.
         Henri