The unique serial number increased your chances of finding lost luggage by putting you in touch with the person who found your luggage, via the Internet. Due to a new demand and new technologies, DELSEY decided to no longer offer this service on the suitcases that used to have it. We are sorry for the inconvenience. Instead, we enable you now to register your warranty directly on our site and upload your bill. The bill is mandatory for the warranty and we feel at DELSEY, from all our customers feedbacks, that this will me very valuable. Bonus: you can also register your suitcase lock's code directly on our site in your account, so that you can always pack your case worry-free! We hope that you will like our new service.