Oh you made me chuckle! You seem to be in a worse place than I am. For what it's worth, I would say keep the marine and the snake satchel which is what you always wanted. Return what you can. Can you sell the grey easily?
I used to be a one blue bag person. This lasted a very long time. Now I have 7 different shades. Is mineral blue or green? If it is considered more blue, then I have 8.

I am definitely sliding down the blue rabbit hole. All that to say, if you only have three blue bags, you're good. They go with a lot of outfits. You'd be surprised.
Let us know what you decide!