Which one appeared absolutely only once? The bento fax machine in file 69.
Which one only appeared 3 times? I think it’s the stretchy suspenders. They appeared in file 18, Movie 2, once in ep 128, and one more time which is currently a spoiler so it doesn't count.
Which one became obsolete around the middle of the series so far? The "voice recording pen" that appeared in file 111 made obsolete by the speaker button that appeared in file 110 and the voice changing necktie's speaker mode.
Which one was used only on the episode of its appearance, then only used in movies, but recently made reappearance in the series? This one has me stumped. Whoever gets this one right, please post the next question.
It isn't the voice transforming mask. It was used twice, once while Haibara was dressed as Conan during the school play, once later while Conan was dressed as Haibara to fool Vermouth, and I don’t remember a file where it appeared recently (like the last 100 files). It isn't the earring phone, which is used a few times. It was used by Ran in file 140, again in file 179 by Conan to try to call Agasa, and in the bus jack case. It isn't the button transmitter which is used in a bunch of files related to the black org.
It could be the button speaker first introduced in file 110. Another possibility is the skateboard, but I have a feeling that I'm just forgetting when it's used.













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