Need Help Identifying Chinese Stamps

My father in law has tried his best to determine these stamps rarity and value. From what we can determine just via google they don't seem to be too common. Any help or a point in the right direction is greatly appreciated.



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Hello!

The first stamp is a parcel post stamp with a gold yuan surcharge applied by Sien Dai Book Co., Shanghai. I believe it is the Type B surcharge.

The green stamp is a 1948 issue - a First Union Surcharge on the $1 green Dr. Sun. These are both fairly common stamps.

The last stamp is the 1948 Restoration of Taiwan Commemorative Issue after the Japanese surrender in Taipei.

I'll need a little more time to identify the overprints on the other five stamps.