Watched the uncut version the other day and didn't see anything else during the credits than just credits rolling by.
No BBK identity and no murders - just text scrolling on.
What version(s) has the BBK and killing going on during the credits?
The version you're talking about is the Balls-Out "Bootleg" Edition which is sadly out of print. Or is it? I would suggest contacting Ryan Nicholson. If you can't convince him to sell you a copy, then you can find it on sites like VeeHD.
To the world you may just be somebody, but to somebody you may just be the world.