The missing MISSING sign

On my way home tonight after getting a rather cryptic clue as to where the final sign for the missing change could be I peered into a store and saw it posted on the wall. Obscure but not inconspicuous. Refrained but not hidden. Well placed. I won't take it down. In fact, I want to see how long it will remain there. It will become part of the legacy. Thank you AA and LR.