Hi Rick,
That's a very nice sq butt I frame you have there, Sq butts are scarce in that time frame and earlier.
Sunray boxes are peculiar to the I & J frames. As far as I've determined, there are only the three sunray styles preceeded by the red plain top box, no gold boxes, and followed by the blue, solid border, post sunray style with printed box end, and no label. They are a nightmare because their use seems to overlap so profusely with all three style introductions jammed into such a short time period.
I detect no correlation of barrel length to box style in my data however and have seen each style all in the same 4" size.
I've attempted to keep track of them in my I frame database by their serial numbers, when they have a visible #, or gun # if they don't (which of course has it's uncertainties re: box originality), and shipping dates. Suffice to say, I do not have a lot of data points, which mitigates any firm conclusions.
Here's only what I have for #'d boxes (and matching guns) with ship dates:
1.) Earliest SR diamond chain box #8858 shipped 1/55, thru at least 11151, 5/55.
2.) Earliest SR dual border is 19334, 9/56
3.) Earliest SR solid border is 35796, 7/58
Earliest post SR solid border (pre Mod 35) is 40116, 1956 until Bangor Punta boxes in 1965.
Not much help I'm afraid except for order of issue....maybe.