郵便 ゆうびん差出 さしだし はこじゃありませんでした
yūbin sashidashiwa koja arimasendeshita

Noun
Desu Copula

The polite, past negative form of 郵便差出箱

1. It was not a mailbox.; It wasn't a postbox.

Past/Perfective
Negative
Polite
Terminal Form