I had all the tools out, but than decided to press the old shifter seal fully back into its recess. It was sticking out about an ⅛ of an inch all around. Seemed to have stopped the leak. It's been just a few days. I cleaned the immediate area nice and shinny with brake cleaner, so far there isn't any detectable leaks on the aluminum nor drips on the card board. Btw, that little rubber donut cost me $10 postage.
Last summer my shifter seal started leaking a little bit (only talking a few drops), so I bought the seal and changed it out. What I noticed though was it was very difficult to press the new seal all the way back into the counterbore, even though I watched the video and did it just like that (my new seal is basically flush with the case – not sticking out at all). So far I don't have any leaks and it's been about 6000 miles. But what I did is bought another seal – only like four bucks apiece -- and made a special aluminum install bushing, so that next time I have to change it out I'll be able to press the new seal in all the way, which is of course required to fully contain oil in the gear box.
