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The arrow revolver page drops from giant red spider, which only appears in alby int with 4 players. The pass that gave that boss used to be alby int for 4.
Soundbox and hellhound skulls I'm afraid I can't answer. I've never seen them drop from solo, but that doesn't mean much, they're rare to begin with.
If you run with 2 or 3 players, you should get the same boss as a for 3 pass, though, I think.