Records notwithstanding, I saw it with my own eyes while walking past (and adding POIs). I stood in front of it with GPS when adding this note so that it is exactly where the building with #3 on it was.

Note that the street addresses here go 1, 2, 4, 5 (in fact, I see two 4 in the default rendering?) ... that doesn't mean there IS a 3, but there's room for it in the numbering and it was on the side of a building :) I'll look in JOSM now.