Conan Edogawa, naturally, identifies the trick behind the "locked" room. The culprit used a looped around Moroguchi’s ring to create a "zip-line" from the small window to the victim's hand. This allowed the killer to slide the key directly into the deceased man's palm from outside the room.
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For a deeper look at how Detective Conan evolved from these early-to-mid-series mysteries into a global phenomenon, check out this video essay on the series' history: History of Case Closed | Video Essay Crunchyroll Presents YouTube• Oct 23, 2020
The one-hour format allows the mystery to breathe, making the eventual reveal feel earned rather than rushed.