After crud removal, the larger coin turned out to be a large cent of unreadable date, probably 1820's - 30's. The smaller coin, if that's what it was, was about the size of a half cent but pitted and corroded beyond all hope of identification. Privy coins generally don't hold up very well, especially the copper ones - the, ah, acidic nature of the privy contents really does a number on them after nearly 200 years...
This was the take from the original dig from the bottom of the south side. Still have to check to see if any of the pottery shards from the two digs match up, I still have a few from the original dig...