We're far less subtle at my work. Nobody brings in stuff to stock for a few days - if someone brings in food it's for that lunchtime and that's it. Nothing gets touched up until lunchtime, but sometimes stuff gets left, eg. someone will rush out to a meeting without having time to eat their dessert/yoghurt/cake.
In this case we eat it. Often we'll post a photo to the work whatsapp group with a caption "were you wanting this?"
Them's the breaks!