Parts crates are Moebius Corps storage containers used to house Balius parts for their prototype Archangel the Balius. When General Carolina Davis and two allied commanders raided the lab, they destroyed these crates to help repair the archangel.
Parts crates are part of the objective in the Co-op Missions map "Part and Parcel". They drop one Balius part. Against zerg enemy composition, some parts-holding crates and buildings are replaced with defense bots.
Terran Units and Structures of StarCraft II
Versus Units and Structures
Units and Structures
Dominion Elite Guard