On PackageRadar website «Arrived at customs» status means these statuses of Post of Slovenia:
Tracking package of Post of Slovenia
With the use of our tracking form you can easily check the status of your package. Also if you want to tracking Post of Slovenia and get your package location updates to your e-mail, you can Register on our website.
Post of Slovenia — is not the only postal service that you can track at PackageRadar. See full list of postal services available.