You need apologize to NO ONE as YOU ARE CORRECT!
Anyone who tells you that there were no 5"/25 shields during the attack are simply mistaken, and, quite honestly, cannot have not researched the attack photography very carefully. I spent five-plus years going through the PH stuff in DC, and there are a number of images which document just what you contend.
See "Pearl Harbor: The Way It Was" by Wenger, Goldstein and Dillon, and look at photo 8-3. There is indeed a splinter shield showing on one of the portside 5"/25s.
Personally, I have not gone through all the BuShips correspondence for all the battleship hull numbers (which needs to be done), but that is what will be necessary to put the matter to rest regarding how many shields were actually in place, BUT AT LEAST ONE WAS.
Incidentally, the negative number from the National Archives is:
Contact me offline at firstname.lastname@example.org and I will pass a scan to you.
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Raleigh, NC 27608