Banjo-Kazooie Wiki

“Oh yeah, 1984! I should've remembered that. It's a real rare date.”
Superstash, Banjo-Tooie

Superstash is a large talking safe embedded in the wall of the Central Cavern in Cloud Cuckooland. There is a Jiggy locked within Superstash, and the safe is more than willing to give it to Banjo and Kazooie, but it has forgotten its own combination and cannot open itself.

In order for Banjo to find the combination and open the safe, four switches are hidden around Cloud Cuckooland, each with a number on it, must be activated by hitting them with Clockwork Kazooie Eggs in no particular order with it being 1984.