I not sure I have ever seen an SP 50 1.1 box, in person, but I do know of a couple. There are of course lots of regular boxes, but still seldom with the serial numbered outside box.
Let's say the box and case are valued at $2000, the body at $1500, the unusually complete paperwork at $500 and the lens at a very reasonable $2500. Seems about right. I have not seen the case obviously but it appears crisp (no SP case can be used, they all fall apart, and the straps break.)
Few on the RFF value paper, I put up a Nikon S2 with paper, not even an offer, I imagine most think it is common.
Of course like all collectibles, they only need one buyer, and these days it's not going to be me.🙂