What documentation do I need to be able to send to Poland?
Considering that Poland is an EU country, documents are not required to send personal belongings.. You only need your ID card and for it to be valid before the authorities, the document must not be expired.
You only need your ID card. and it has to be valid before the authorities, the document must not be expired.
Moreover, you also have the option of travelling with your Passport. This document has the same validity as the ID card, so you choose which you want to take with you.