Time Capsule 21 is a Warhol art gernade. Meaning he made it, stuffed it in a closet and now years later it goes off. Imagine this request, “I need 600 boxes this size. I’m going to put crap in them. You know bits of trash, negatives I don’t care about, photos that I was going to toss. Then I want you to lock them away paying the bill for the storage for something like 20-40 years. Once and for all this place will get cleaned up!”
And they did it because he was Andy.