Note: I would add "China Stamps" into a more descriptive title in order to attract more relevant eyes.
Thank you for the clearer images. Obviously you have honed in on the stamps that have the greatest value potential of anything shown thus far. I will be interested in hearing opinions from China experts. The early China and China with overprints can be forgery/fake minefields. The stamps need a trained eye and you may have a great collection here.
Likely will still need to post clearer images in order for a proper review. Do you have a scanner or access to one?
In my quest to determine if my Chinese stamps are authentic or not I found out that the Imperial Meritime Customs Post stamps, so the first Chinese prints of the green, red, and yellow dragon all have a perf measurement of 12 1/2. Hope that helps as it may be one of the easier ways to determine if they are authentic or fake.