You are correct, the botton holer and plate would not have been sold with the attachments.
As to worth- I don't see the feed dog cover plate or the longer mounting screw for the buttonholer.
For the other set, you have a couple of feet from the set that would have come in that box, and a few that probably came with the machine the cover plate went to. It looks like the foot above the ruffler has the adapter on it. If you don't have the adapter, then it's not worth much. Even with the adapter, it's a very common set and worth maybe $9 . . . and that would be if you had the complete set, and you don't unless you have a few more that aren't shown.