April 23rd, 1984

Japanese Letter Text:

けいさつの あほども え
おまえら うそ ついたらあかんで
うそは ドロボーの はじまりや
ちょうせん状は 甲子えん けいさつえも
おくったやないか かくしたら あかん
なきごと ゆっとる ようやから
また ヒント おしえたろ
工場えは 通用門から はいった
タイプは パンライターやポリ「よおきは
ひろいもんや
かい人21面相

English Translation:

To police fools. You shouldn’t lie. If you lie, you steal. I also sent this to the Koshien police. Why are you lying. Don’t hide things. Why are you complaining? You guys are having such a hard time, so I will give you a hint. I entered the factory from the side staff entrance. The typewriter we used is PAN-writer. The plastic container used was a piece of street garbage.
Monster with 21 faces

April 23rd, the Monster sends a letter to both Sankei and Mainichi newspapers as well as the Koshien police station.

On the envelope, the sender was listed as, "Abductor". With no stamp affixed, the postmark was set in Kawachi, East Osaka, two days prior on the 21st.