olemus
üüritav postkast postkontoris või muus avalikus kohas
= a small, locked compartment, usually in a post office, into which the mail of a box renter is put to be called for

ülevaateid
https://medium.com/@biankacardwell/po-box-vs-private-mailbox-6de19b8ba4eb

https://en.wikipedia.org/wiki/Post_office_box

https://goremote.virtualpostmail.com/article/reasons-for-renting-a-po-box