I have three green cardboard boxes, one for a 99K (1934) and it sais "Singer accessories for 99K machine" , one for my 201 (1950), and a rather random attachment box with no model numer, just the Singer name in red. The last one is slighly shorter, but fits the clip fine. My 99K and my 201 came with the old type user manual too, green booklet.
By 1955 the new box and manual were introduced, at least on m 201K23.
This is the type that came with my 99K. I don't know if any of
the metal tins fits the bent wood case, there is
a green tin case too, but I think the early ones were carboard. The early 99 came in a black suit case type encasing too, and I guess it has different arrangment for the loose parts.