Unreal marketplace: https://www.unrealengine.com/marketplace/scifi-crates-pack
14 High-quality and completely customizable crates with PBR materials. Ideal for 1st/3rd person games. Customize PBR values & colors to achieve the specific look you desire. Personalize your assets to create props that are unique to you and your vision.
Also there are standard textures without the possibility of customization.
Texture Sizes: 2048x2048
Collision: Yes automatically generated
Vertex Count: 32 to 836
Number of Meshes: 42
Number of Materials and Material Instances: 2 master 40 instances
Number of Textures: 127
WIP on polycount: http://polycount.com/discussion/196214/wip-scifi-crates-pack-1