The one in the second link is a special favorite of mine.
Here are the original comments from that post plus the photo, and then other J8D- or *8D- creeds for comparison:
http://forum.purseblog.com/coach-shopping/authenticate-this-coach-763164-267.html#post23316063
"Two problems - there are tons of questionable and fake bags out there with serials starting with J8*- usually with H-, D-, or Y- plant codes, and all of them are potential fakes. Right now it seems that possible fakes outnumber possible genuine bags with those prefixes.
Second -If you look closely at where the bullet is stamped, you can see exactly WHY they put it where they did. The word the bullet is stamped over is supposed to be "grain" but it sure looks like the first letter is actually a "C". Compare the general shapes of the other Gs and Cs on the creed to that letter (the shapes of the Cs and Gs on that creed stamp are very slightly different), and also notice that there's no little horizontal line in the center that would make it a G and not a C. That kind of mistake would NEVER be found on a real creed stamp, especially from as well-established a plant like the "D" plant.
So keep in mind - there ARE fake "overstamping" marks, and there ARE fake outlet marks. I'll post the photo here for reference.
EDITED TO ADD - Another thing I just noticed is that the name Coach at the top is very slightly tilted inside the cartouche. The C in front is higher than the H at the end, and it's not exactly centered either, the C is closer to the edge than the H is. We're talking maybe half a millimeter, but it's definitely uneven."
The pics below the first one show how the G in "grain" and the cartouche and border should actually look.