I have this case that I used for a few years to store my eyepieces, etc. until I bought a larger rolling case.
I do not have foam for it but I used eyepiece bolts or boxes. It does have keys and locks.
It measures 18 X 14 X 6 1/2" which might even hold a small telescope.
It was used for electronic tools, etc. and has several pockets in the top and can store books behind it. It was very handy when I used it.
Anyone interested at