I just saw one at a local shop the other day. It was not in the best shape, but it was complete. I remember because it has Jim Zorn on it and I asked to see it up close (78 was the first year I bought packs).
I bet the owner would let it go fairly cheap if you wanted it, assuming he still has it. he turns stuff pretty fast as he prices to sell.
http://www.djssportscards.com
Nevermind…turns out that was a 1979 box now that i just googled it. It had 78 Topps cards inside of it like someone had ripped packs and left the cards in the original box, so just assumed...