Last night after the official weigh in (which uses Katherine, a 0.5 pound resolution bathroom scale, and a cat), we tried to weigh the boys on the higher resolution kitchen scale by waving kitty treats over it. (We did move the scale off the forbidden kitchen counter.)
Whitey came in just under 12 pounds, consistent with his official weigh-in.
Billy came in as ERR. After three tries, I checked the bottom of the scale -- it's only good to 5.5 kilograms, or ~ 12.1 pounds. Gong!