Original names needed, Magenta stamp, Other places

[Olivier]

Here we go again...

DD FC 422:    (p 4, panel 6)
                          "Here's his name on the flyleaf! It's Philo T. Ellic,
                           120 Swankmore Drive!"
                (pp 25-6)    "Miss Susiebelle Swan, 60 Honker Street,
                                    Mudhen, Ohio, USA"
                                     "She left in 1880! Gave a forwarding addess
                                     of  10 Quack Road, Webfoot, Oregon!"
                                    "She floated away in 1910! Said to forward her
                                    mail to 45 Mallard Avenue, Duckburg, California"
            Browsing through the many links I haven't list on M&D yet, I found
            a page with redrawn panels from this story and-- a picture of  the
            Magenta stamp!
            Can anyone tell me where it was?

DD FC 108:    What story is that?
                          There is one "Doctor Carver Beakoff [MD, QQC],
                          Number 249 Groaner Building" at the end of  "The Firebug",
                          but that's not the one.

Other places (outside of Duckburg) I can think  of:
    Omelet (WDC&S 146, Album 22)
    Pizen Bluff (U$ 26, U$ 306)
    Pizen Spring Dude Ranch (WDC&S 102, March '49, Album 15)
    The infamous Mt Mushmore in Great Head Park ("Losing Face",
    WDC&S 24, Sept '57, Album 33); on the way to Daisy's Aunt Matilda's,
    who lives in Swanville
    Mocking Bird Ridge (WDC&S 215, Aug '58, Album 36)