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You should contact them. Did you save the IMEI of your sent device? If yes,you can check it on this one too. Maybe @Rickard can take a look.
Hi Smithers,
Welcome to the community,
In such a situation, I suggest that you speak with Sony Mobile Customer Care within your region, they will be able to advise what repairs were done on the device and if the handset was replaced etc.
Use my signature to find the details for your region.