Hi JD--
Giving my usual caveat of the difficulty of grading coins from images (see my own threads on 90CC and 91CC for problems with images) and not taking into account possible damage or cleaning, and admitting that the images aren't all that clear, I'll give them these grade ranges:
90CC - VG-10/F-15
91CC - F15/VF-20
92CC - VF-20/25
92S - VF-15/20
93 - VG10/F12
I used my own PCGS-slabbed Morgans as a reference collection. For comparison, my highest PCGS graded circulated Morgan is VF-30 (93CC) and has somewhat more obverse hairline than your 92CC, so I started from there. However, given my recent drubbing by PCGS, these grades above might be slightly generous. Whatever you do, don't clean them! Leave them just as they are. Don't worry about the dirt or tarnish or whatever is causing the darkness; I have a PCGS slabbed 89CC which is really dark and a 79CC slabbed by PCGS which is even darker, almost as dark as your 90CC; both are slabbed G-06.
One thing I have to constantly remind myself about Morgans, especially after a mauling by PCGS is that there are only a finite number of them and that anyone who has even a single Morgan has a measurable part of a piece of history which is mine, mine, MINE! They can't take it away from me. I treasure them all!