だい いち しゅ郵便 ゆうびん ものじゃないです
daiichi shu yūbimmonojanaidesu

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 第一種郵便物

1. It's not registered mail.; It's not first-class mail.

Negative
Polite
Casual Register