Funny...I have over 50 Nirvana seeds of various varieties that I bought back in 2006-2007 that I have been keeping in the fridge with a desiccant. So far, every single seed has been viable.
Currently, I have 5 Nirvana going that are about 3 weeks from seed. 3 Jock Horror, 1 Pure Power Plant and 1 Durban. I'm going through the packs with fewest seeds and I just polished those three strains off.
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I've heard there is a legendary pheno of the Jock and obviously I have my fingers crossed to run into that one. I have plans on starting a bonsai mom tent and would love to have access to that one whenever I want. I did PPP a few years ago and got the purple pheno that Mister Postman also had. Very pretty plant. I had the cat piss Durban pheno when I grew that one out a long time ago. It was unique...that smell was crazy. Not for everyone and tough to carry inconspicuously.
From what I understand Nirvana were f2's of the featured line (Serious AK & Bubbilicious, Sensi Jack Herer, DJ Blueberry, Mango, etc). Unless you are dead set on getting the original genetics, I kind of prefer the crap shoot that Nirvana provides, especially for the price. It looks like they have moved away from regular seeds, which is a little disappointing because the chances of finding a stud from the genetic diversity are there as well.
You have seeds from the right time frame to find the famous Jock. The Jock pheno you are looking for will be a big plant. Long internodes, with fat leaves initially. If you have the headroom it will hit 6 feet. Christmas tree shape with a monster top cola. Side colas can get as big as some strains main cola. Trich coverage is insane.
Nirvana being F2's is not true. They were mostly knock offs or in some cases Mau crossed a given strain with what he called a non-dominate Skunk male. The Afghan was an Afghan clone x that skunk male. The Jock was a true knock off, and used NL, skunk and Haze parents but selected by Mau. The only F2's that I'm aware of were White Widow I believe. Nirvana acquired a single pack of WW and selected parents from that pack. Their White Rhino was their own Afghan x the WW. The Bubbleicious was NLxBubblegum x NLxBubblegum.
This is from memory, so forgive me if it isn't 100% accurate, but that is my recollection.