Which compartment in the sorting cabinet should I use for letters with no postcode?

How to say “Which compartment in the sorting cabinet should I use for letters with no postcode?” in Japanese

In Japanese

郵便番号(ゆうびんばんごう)が書(か)いてない手紙(てがみ)って、区分棚(くぶんだな)のどこに入(い)れればいい？

Yūbin bangō ga kaitenai tegami tte, kubundana no doko ni irereba ii?

Which compartment in the sorting cabinet should I use for letters with no postcode? in other languages