score:7
Milan city council runs a lost&found service which can be contacted at these phone numbers:
They advise you to contact "Polizia ferroviara" and file a report before contacting them but since you skipped this step I'd try to contact them anyway.
I wouldn't hold my breath but good luck anyway!
Upvote:3
If your lost bag came back to Bern (and you'd be very lucky) you can try with this web page https://www.ffs.ch/stazione-servizi/servizi/servizio-oggetti-trovati.html
If someone found the bags in Italy. I'm very sad to tell this but will be very hard for you to recover that/