David,
Without some digging, I don't have a firm answer. USS FOGG (DE-57) was converted while being repaired for battle damage at BosNY, which was completed in early June 1945. However, she actually was slated for conversion to a DER, which was done at PhilNY between 1 July and 2 October 1945. Between those two yard periods in June 1945, she did return to sea serving as a "multi-function" training, plane guard duty, etc. There were seven BUCKLEY Class DER conversions with 5-in guns; DE-51, 57, 153, 213, 223, 577, and 578.
So FOGG's upgrade at BosNY shouldn't be confused with the dedicated 5-in conversions done to eleven BUCKLEY's; DE-217, 218, 219, 678, 679, 680, 696, 697, 698, 700, and 701.
From the images I have of USS FOGG at BosNY as she was nearly completion, there are a lot of similarities in armament between the two groups. Two single 40-mm gun mounts were installed forward of the bridge, two twin 40-mm mounts amidships, and a quad 40-mm mount aft. I'm unsure about if all the 20-mm guns seen on the DE-217, 218, 219, and 678 photos, were installed on FOGG. The "full" 1945 DER conversions had a twin 40-mm mount forward in place of the hedgehog and two 20-mm mounts in place of the single 40-mm mounts forward.
Without digging through DANFS, which I don't have time now to do, I can't say which other units out of these two groups went to sea before the war was over. It appears likely few if any did and that none saw combat.
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