I believe there was a large article on it in The Linking Ring some years back.
And when Kellar did it, he billed it as "The Witch, The Sailor, and the Enchanted Monkey." There is a marvelous poster that has that title about 1905. I can't recall if the script remained the same as the Maskelyne version, but something in the back of my memory says it was.
The prop that makes the magic and the various switches possible is a large cube. Kellar's was made in England and shipped to New York.
The Carter Collection in San Francisco had the prop (it may have been Kellar's, I don't recall) and I assembled it. It is massive and heavy, the mirrors being chromed or nickled steel. This was a prop made to troup and be used daily back in the day when things were made of steel and solid wood.
Back in 1957 there was an article in MUM on Bob Sherman who remembered his experience with Kellar.
Harry Kellar? That reminds Bob of a bruise he still has on the base of his right foot. It happened this way. When Bob was about nine years old, he saw the Kellar Show in Bridgeport, and came up on the stage for 'The Witch, The Sailor and The Enchanted Monkey" illusion. He was permitted to examine the large cabinet, and tried to put his fingers into a large crack (where the minor was concealed). He tried to pull the panel open, and yelled, "Look, Mr. Kellar, here it is - look, here it is!" Kellar had a long curtain pole in his hands. He slid this along the floor of the cabinet until it reached Bob's foot, which he hit real hard, and several times. Bob got the idea, and stopped yelling about the secret panel. While the bruise remains, there were no hard feelings. Many years later, after his retirement and on a trip east Kellar visited Bob in the Philadelphia Magic shop, and did his famous Torn and Restored Strand of Wool for him.