返信 へんしん よう封筒 ふうとうじゃありませんでした
henshin'yōno fūtōjārimasendeshita

Noun
Desu Copula

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

1. It wasn't a reply envelope.; It wasn't for replying.

Past/Perfective
Negative
Polite
Terminal Form