Cairo declares his intention to search Spade's office for the black bird. He searches Spade's pockets for any concealed weapon, but this turns out to be a mistake. Spade elbows Cairo in the face, and after a brief struggle, Cairo is knocked unconscious.
Now it's Spade's turn to go through Cairo's pockets. A leather wallet containing $365. A Greek passport. Three colorful silk handkerchiefs. A newspaper clipping detailing Archer's and Thursby's murders. A ticket for a performance at the Geary Theatre that evening. Some slips of Hotel Belvedere writing paper with Spade's name and addresses on them. And various other odds and ends.
When Cairo finally comes to, Spade tries to obtain more information about the black bird. Cairo refuses to state who he's working for, but again offers to pay Spade $5000 for the return of the bird.