Usually there's no need. You automatically receive an email as soon as there is news or an outcome.
Once the investigation starts, you receive a confirmation email. After that we keep you updated by email; we only send interim messages when there is a development.
New information, or want an update anyway?
Reply to the investigation's confirmation email. For example if the parcel has since been delivered, if you have information that helps us, or if you want to know how things stand.