to answer you first Authorized Shares is 500,000,000 a/o Apr 01, 2014
and they are not traded :)
and the float trading is Float 473,245,458 a/o Apr 01, 2014
it is what you need to know is the float :)
hope it help you
and the difference with the OS is maybe in Treasury
but what we trade is only the float
so it is why it is why i love this stock because float is really small even the Authorized Shares
all sounds good :)