Technically he has the first Zork game in there (1977) which is even older....1986. He's got Ultima 4 (1985) and even Wizardry 1 (1980).Appropriately, I have the oldest thing presented so far:
Your stuff is not old enough, old man.
What I do find a bit weird though is that he has Sorcerian but not the original Dragonslayer (or indeed Atari's Adventure which arguably was the inspiration) or Ys. Whilst he has some of the classic text adventures, some of the real good ones like Spellbreaker that not only were good games but a heap of paraphernalia with them would be worth adding to the collection.