The Recipient After Death

I'm a courier for a residential complex. Since last month, I've been receiving packages addressed to the dead. An empty apartment building, recipients whose accounts were closed long ago, parcels that no one ever claims. The property manager says I'm seeing things. My coworkers say I've been cursed. The police checked every security camera, but say everything looks normal. That is, until I opened the first package for a dead person. Inside was only a note: [You're next.]