特殊 とくしゅ取扱 とりあつかい郵便 ゆうびんでしょう
tokushu toriatsukai yūbindeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 特殊取扱郵便

1. Probably special handling mail.

Polite
Presumptive
Conjecture