I am not seeing any signs of a cleaning that left hairlines scratches on your coins. The coins may have been over dipped in a acid before putting them in the case that could have caused the dullness look on the reverse, but it could also be your photos not picking up the luster because the photo of the 1921 sitting in the case is showing MS type luster.
Here is my take on what happened. The coins were put into the case without any toning with the white/silver MS look on both sides. The darker felt that the coins sit on does not have any sulfur in the material, so no toning on the reverse. The sulfur is in the top cloth white lining that caused the toning, and that is why the obverse toned.
Here is my take on what happened. The coins were put into the case without any toning with the white/silver MS look on both sides. The darker felt that the coins sit on does not have any sulfur in the material, so no toning on the reverse. The sulfur is in the top cloth white lining that caused the toning, and that is why the obverse toned.































