Some of the photos match those in the Kelleher catalog from the 1991 Joyce sale.
I see a total of 2 stamps that match images in the Joyce sale catalog. Unless you have other images, it's a bit of a stretch to assume all of the material came from Joyce. It could easily be that the owner of this material had purchased a few items from that sale or a subsequent buyer/owner and folded them into his collection.
EDIT: 3 items; I missed the block.