So here it is! The Warsaw Office sent me an e-mail that my CORP is ready to be picked up.
This is what they wrote:
We would like to inform, that passports with visas and other immigration documents for you and your family are ready to be picked-up. Please arrange for the pre-paid courier services (DHL, UPS or TNT, not FedEx). Please contact one of the commercial courier companies (DHL, UPS, TNT) and ask them to pick-up your documents from the Embassy in Warsaw/Poland at your charge. You can also arrange it through internet (i.e. UPS has such service) and then send us by e-mail UPS etiquette with a bar code (you are responsible for all costs of the shipment including collection fee).
Do they mean - they would only accept DHL, UPS, and TNT??? I had my papers sent to them by DPD, and it went well. I wonder if I could use DPD again. The problem with DHL and UPS in Latvia is that they do pick-ups solely for business customers. They totally refused me! Gotta call TNT tomorrow morning, see what they have to say about pick-ups. Hopefully, it all works out! So stressed out! Just want my papers finally here with me!! ???