The culprit is Motoyuki Tojima since he is the only one with the crane's beak pointing at 2 o' clock when the bloodstain was at 10 o' clock. The real tray having the bloodstain from the victim's view was pointing at 2 o' clock angle, which when Agasa flipped it horizontally, the crane's beak was at 2 o' clock angle while the bloodstain is at 10 o' clock, which is perpendicular from each other. Conan tells that nor Sakamaki or Chono would have been able to kill the appraiser since swinging the spear for them would have caused the floor to creak and the appraiser to look behind and see the culprit. Tojima says that even it would have made noise, Nishitsu wouldn't have been able to hear anything since the aid wasn't functioning. This last sentence Tojima said proves that he is the culprit since he shouldn't have known that it wasn't functioning at the time unless he was there in the room with Nishitsu which makes Tojima confess that he didn't want to kill him. The motive for killing the appraiser and snatching the real tray was to cover up the cost of his daughter's operation which cost about 5 million yen while he thought his tray was fake and of no value. Subaru Okiya tells him that in fact, his tray was most probably a prototype made by apprentices and its value should be able to cover up the costs. Tojima bursts into tears as he realizes he had killed the appraiser for nothing. The real tray belongs to Kinji Chouno and he was willing to lend it to Sakamaki for her exhibition at a reasonable price. The proof that it was the real tray was because since Nishitsu was sitting in front of the real tray's box, the blood that would splatter from his head would have likely fallen into the real tray's box just in front of Nishitsu and the only box with blood spots inside is the old man's.
After the end of the case, Sera questions Mary about the "50:50" catchprase. Mary replies that it is her catchphrase as well, and it's a line that her husband used to say and her son Shuichi inherited from him. Sera informs her mother that getting the drug at the moment is diffucult since Subaru is standing in her way, which surprised Mary. After learning the truth about the "50:50" catchphrase, Sera suspects that Subaru is Akai, but attempts to deny it since she thinks that her brother is supposed to be dead.
