A Secure Galactic Federation Crate is a container that was only seen on Aether in Metroid Prime 2: Echoes. It is indestructible, being "made up of the strongest materials in the cosmos." Their strong composition suggests they are used to guard precious materials. They are only seen in the Industrial Site.
"Object scan complete.
This is a Secure Galactic Federation Crate.
These crates are made of the strongest metals in the cosmos. They cannot be destroyed."