Noun packing box has 2 senses

• packing box(n = noun.artifact) stuffing box - a small chamber in which packing is compressed around a reciprocating shaft or piston to form a seal; Array
is a kind of chamber
has parts: packing nut, stuffing nut

• packing box(n = noun.artifact) packing case - a large crate in which goods are packed for shipment or storage; Array
is a kind of crate