The addressee normally doesn't receive personal mail at the office. Unusual addressing or Delivery Instructions . Name and title of addressee aren't accurate. The sender is unknown. There's no return address.
Mailing emits a peculiar odor.
There's a smell of almonds or marzipan or any other strange smell coming from the package or letter. Sender's Writing . Any mail should be treated with caution if it features a foreign style of writing, not normally received, on the address. This goes along with the Place of Origin. Protruding Wires .