Sorry for the basic question, but how do you actually start one of these diaries?

Following this because I am in the same place and have no idea what to ask at the appointment.

Stupid question: how do you know whether what is in the vial matches the label at all?

Do you contact the customs office or the carrier first?

How do you get a clear photo of an imprint? Mine keep coming out blurry.

Print the page.

Reminder that a tracking number is not required in the post, but the dates and the carrier are.