Along with the old title: "Tribute to Information", I recently read another title for Kryptos in the online CIA Reading Room.
cia-rdp92g00017r000800010003-6

"A game for viewers". Hope you are still enjoying the game.

The first part is independent confirmation of Sanborn's story i.e. 

At first, Sanborn refused to share the secret text with anyone, including CIA Director Webster. This caused some problems. About halfway through the sculpture's construction, 25 tons of stone that Sanborn had delivered to CIA headquarters mysteriously disappeared overnight. "No one would tell me what happened to it," says Sanborn. "The agency agreed to reimburse me for the stone, but I had to agree to deliver the encoded text." Sanborn gave a copy of the text to Webster in exchange for paper pulp from shredded CIA documents that the artists is now using in other works... (Art in America, March 1991)

Transcript of page 1 handwriting

(1) We need the message
(2) We need the code
(3) We need 1 and 2 in hard copy
Complete in _July_
lost 10k in stone
upset about comments

Transcript of page 2 handwriting

(1) We want the _message_
(2) We want the key or code to how get there
(3) We want hard copy
(4) What does the contract call for
Sanborn - passed out two copies took them back - said he'd decide who to give the code to.
What the hell is going on?
Complete in July!
lost his stone
(1) money <- 10K ✔
(2) respect that he has not, need
came outlined 
(3) -> code

(my interpretation: The first line makes sense by itself "Respect that he has not [given us the message, key and/or code], [we still] need [it]"
The second line probably doesn't have redacted or erased text around it, but means something like "he gave us an outline of the message".)

Page 17

The artist considers all messages to be benign and aims to present a game for viewers.