A receipt should be given to you by porter like its done at the airport. This is prove that you checked the bag at the port to be loaded on to the ship.
There's a support group on all Celebrity ships you might be interrested in going to their meetings.Ask at guest sevices where and when the Friends Of Onion Soup meet.
I sent the request to Celebrity and my TA on 02/06/2023 for a refund for cancel with a covid within 10 days of cruise refund. I received the refund 02/21/2023. I consider that excellent service fro Celebrity and my TA.