I lost my bag. I found it three days later, but the 20000 yen that was in it before was gone. The other things I had in the bag were all there.
ご質問ありがとうございます。
"I lost my bag."＝「バッグを無くしました。」
"I found it three days later,"＝「3日後にそれを見つけました」
"but the 20000 yen that was in it before was gone."＝「でも、以前入っていた2万円は無くなっていました。」
"The other things I had in the bag were all there."＝「その他、バッグに私が入れていたものは全部ありました。」
ご参考までに。
アメリカ合衆国 
