The RUST Spray Can Decal is a placeholder item not spawnable from the F1 console, introduced with the Combat Update in June of 2022. These overlay decals (though only one is visible in game file interfaces) are part of 9 unique decals added with the Graffiti Pack in the permanent General Rust store in game.
If spawned via give command, the item appears as a gray RUST logo on a translucent square in the player’s inventory. This item has no purpose or use.