Your texture could be a single side of the crate and you would arrange each UV shell to use 100% of the texture. In 3dsmax you click on each face, then click "quick planar map". There are 5-6 other ways to do it but that's probably the easiest. If you're using maya there are similar functions, but I don't have it installed…
Hey there, welcome to PC. Context, I'm not sure what kind of game these would go into, what engine you would use or how important these objects are to the overall game. Without that info its kind of hard to give a critique. Also make sure to count triangles not polys. The crate: - There is a lot of similarity in the…