I'll wait for Fog to give the official response but my suggestion is put nothing but rares in there if you wish to share them. And usually no family credit is given for placing in the vault since it is really hard to keep track of who puts what in and takes what out.
The Family Marketplace will be up and running shortly after launch and this is where you should trade materials for family vault credit.
Unfortunately there seems to be a need for people to place anything form bait to rares in the vault at the moment. If it was a rare bait - I could see that, but we as a family, are placing way to much junk in the vault during these betas. If this keeps up we will have to take stuff out and sell it - giving the money back to Fog to buy stuff for family events (such as siege equipment for AvA).
You should really think about breaking down the stuff you found and using it to fill orders made by the crafters for cloth, wood, ingots - as well as the other odds and ends you get from the deconstruct - such as pitch, honing stones, and hemming as well as the gems for enhancements. Believe me when I say that pitch, honing stones, and hemming will be in great demand since it is seldom you get it from a deconstruct. Or you might find crafter's willing to buy the greens for their own deconstructing.