Formal — to staff
Train · Station · Lost · Found
You
すみません、〇〇線で財布を落としてしまったかもしれません。何時頃の電車だったか覚えています。
すみません、まるまるせんでさいふをおとしてしまったかもしれません。なんじごろのでんしゃだったかおぼえています。
Excuse me, I might have lost my wallet on the 〇〇 line. I remember approximately what time the train was.
Romaji: Sumimasen, marumaru-sen de saifu o otoshite shimatta kamo shiremasen. Nanji goro no densha datta ka oboete imasu. / Reply Romaji: Dono atari no eki de orimashita ka? Tokuchō nado kuwashiku ukagaemasu ka?
Reply
どのあたりの駅で降りましたか？特徴など詳しく伺えますか？
どのあたりのえきでおりましたか？とくちょうなどくわしくうかがえますか？
Which station did you get off at? Can you tell me more details about its features (e.g., color, content)?
Gesture & etiquette
Looking worried, slight bow, pointing vaguely as if searching.
Be prepared to provide as many details as possible: train line, approximate time, car number (if remembered), direction of travel, station of boarding/alighting, and detailed description of the lost item. You might be directed to a Lost and Found center or police station.