- The initial message was sent out by Jirochi (the rich uncle) to lure the real Kid in opening the safe. At the same time, Jirochi has a partner who DISGUISE AS JIROCHI, and is hiding in the safe. They swap role every night after dinner (one goes back to the safe, the other goes out and be Jirochi. The talking that the guard hears is for them to update the situation amongst themselves.
- The partner does not have to know how to open the safe from outside: with some signal, Jirochi can open from the inside. The cane is used as signal for the inside person to open the door.
- Hence, Jirochi sent out the message to lure the real Kid into opening the safe. It is a win-win situation for him. If Kid does not turn up, then he wins. If Kid turns up and does manage to open the safe: then the guy inside can catch Kid. The guy inside is probably inspector Chiaki mentioned several times in the story.
- To make sure that Kid will get interested in the safe, Jirochi provided opportunities for Kid by hiring new staff. Without providing this opportunity, Kid could have declined the offer.
- So, Kid, disguised as the maid, turned up, and slipped the paper in the room. On that day, however, the REAL Jirochi was inside the safe, and the fake one was outside. (They would swap position after checking the safe). Therefore the FAKE Jirochi (Jirochi's partner) did not want inspector Nakamori to check the face of the staff, because he himself was in disguise.
- By creating the scene with Kogoro dropping the coins, Kid could confirm that it's the fake Jirochi (because he's right-handed, whereas the real one is left-handed). Hence Kid (the maid) pretended that Jirochi asked for her. Because the FAKE Jirochi thought that this was the real Jirochi's request, the Fake Jirochi allowed the maid to come to the room with him. There, Kid (the maid) drugged the guy, came out as Jirochi with the cane, going to check the safe. He also got the remote control of the security sensor, and prepared a fake one to hand for the REAL JIROCHI.
- Now, Kid The Jirochi stuck the cane inside as signal. Real Jirochi opened the safe, and they swap place. By the time the file finishes, Kid is INSIDE the safe with the controller for the security system, while the Jirochi outside is real, and thinking that he got the upperhand of Kid, is happy to leave. Kid probably said something to the real Jirochi so that he will be in a certain place.
PREDICTION: Kid would turn off the security system by his remote control, open the safe to get out. Then he turned on the security thing while standing in the room, and started making noise -- so that everyone knows that Kid has appeared! As people poured in the room, Kid disguise as one of them. Due to the weight difference, the cage will start going down, causing everyone (the guards) to panic and runs back out -- and hence Kid gets away, with the safe opened.
MAN!! I can't wait to see how the last file turns out!!
