Enforcement Rules of the Government Procurement Act Article 29
The term "in writing and sealed" referred to in paragraph 1 of Article 33 of the Act means packing the tender in an opaque envelope or container and sealing it with paste, glue, tape, staple, rope, or other similar materials.The name and address of the tenderer shall be indicated on the envelope or container, and the tenderer shall have its own choice on the place of mailing.The term “designated place” referred to in paragraph 1 of Article 33 of the Act shall not be confined to the post office box number of an entity as the only place of receiving tenders.