You got a decent price on it!
I love puzzle boxes, and so far only have 3. One I got on ebay, had all of the feet, wrench, etc., one was a gift from my MIL...only had a few things in it, and one came with my 115, and had a TON of stuff in it, lots of extras.
The one you got is for one of the "15" models... see the two wires that kind of stick up? Those are for round bobbins. There's another style that holds the shuttle bobbins...