Some of the first "Chronic" cd's that were sold DID have a zig zag in them. It was a special collector's zig zag tho. Came with the cover of the album printed on it (as funny as it sounds, it's true.). You can find it on ebay every now and then.
As far as the "Doggystyle" album, the first shipment had "Tha Next Episode" listed on the back tracklist, as well as a track "G'z Up, Hoez Down". In this first shipment, the cd itself had "G'z Up, Hoez Down" on it, but not "Tha Next Episode" (even tho the tracklist said it did). So, to answer your question, the original "Tha Next Episode" track was never released. I have it, but it's bad quality