Hello Pamaumbi12
This line is in France. You could perhaps contact the SNCF Lost and Found office in Strasbourg tomorrow:
https://www.ter.sncf.com/grand-est/services-contacts/services/objets-trouves
Strasbourg
Quai n°1 de la gare (au débouché de l’escalator du souterrain central, à droite)
Ouvert du lundi au vendredi, de 10h à 12h et de 13h à 18h
Platform n°1 of the station (at the exit of the central underground escalator, on the right)
Open Monday to Friday, from 10 a.m. to 12 p.m. and from 1 p.m. to 6 p.m.
Kind Regards
Danhiel