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Koji's name was on the APTX list when Shiho/Ai and the BO went to check Shinichi's house for the first time—I assume this was not too long after the events of File 1—this means Koji had already been given the drug, at that point. Ran says that it "hasn't been a year" since her visit to the aquarium with Shinichi—which must've been not too long before the events of File 1—and she remembered this in File 882. This likely means 7-10 months (my estimate) passed between the events of File 1 and the events of File 882. Quite some time had passed since then when Masumi arrived enrolled at Teitan High just before the events of File 768. I find it more likely that Masumi and MG would've come to Japan immediately after the latter shrank—waiting nearly a year to approach Shinichi/Conan when Masumi clearly believed Conan was Shinichi from their first meeting doesn't make much sense to me.