Trust me, if there were another known, verified book of the Apostle Peter or John just lying around in a bookcase, it would be part of the Bible.
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So, you would add to the bible?
The bible is the verified message of the apostles.
I would certainly add an absolutely proven writing of one of the apostles to the bible. Others have argued with me over that one, but I am subject to the Apostles by instruction of Jesus Christ.
IMHO, though, such a thing will never, ever happen.
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So, you would add to the bible?
Wouldn't have to, it would already be in the Bible, from the beginning of the Church.