返信 へんしん よう封筒 ふうとうではありませんでした
henshin'yōno fūto udewa arimasendeshita

Noun
Desu Copula

The polite, past negative form of 返信用の封筒

1. Was not a reply envelope.; Was not the envelope for replying.

Past/Perfective
Negative
Polite
Formal Register