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