I just received the basic starter kit NN4 and while looking over the parts included and assembling it, two questions come to mind:

1.) What are all the baggies of parts, washers, o rings and such for?

2.) Why do I have a second camera plate?

3.) My 5DII has the Canon battery grip on it, and so the tripod hole is offset from the center-line of my lens, do I need something more to adapt this to get it centered? The manual states that there is some sort of offset plate that's included in the kit to relieve this issue but I don't see anything.