だい しゅ郵便 ゆうびん ぶつではありませんでした
dai nishu yūbimbutsudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 第二種郵便物

1. It was not second-class mail.; It was not the second type of postal matter.

Past/Perfective
Negative
Polite
Formal Register