typical disposable aluminum tray. It's an off-the-shelf model I bought at my local supermarket and scanned using PhotoScan. For cleanup, I used blender. I make it low-poly (< 1k vertices) so you can use it for any real-time renderer.
Used for my "Playroach" project:
https://sketchfab.com/blogs/community/the-making-of-playroach/