Bread & Butter

Another very tasty dinner tonight, but what I really want to know is what happens to the leftover butter & bread in the bread basket.  While waiting for dinner, a bread basket with at least 6 pieces of bread are brought over to my table along with a pat of butter on a very cute dish with a dome cover.  I can only eat 1 or 2 pieces of bread and a small portion of the butter.  I wonder... is the bread & butter disposed, perhaps used by the staff or potentially passed onto the next customer?