reference needed

[Nils Lid Hjort]

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). For civilisations with four fingers
per hand one might speculate that the inhabitants would
develop the octal rather than the decimal number system. 
Perhaps Scrooge counts his money in an octal way, for example. 

I think I remember seeing, some 20 years ago, a cover on 
the Norwegian weekly Donald Duck & Co., where Mickey is shown 
(on a green background), close to a telephone, with *eight*
rather than ten slots (we are talking pre-digital, circle,
manual telephones here, of course). 

Can anyone confirm this, and ideally provide a reference? 

Nils Lid Hjort