Nice finds, those coins are thin to begin with. Hard to pick those out of Nova Scotia's soil without some kind of deterioration.
It is strange soil here for sure. For example you could hit a old yard and get 3 rotten coppers and one thats perfect and then go across the street and get 3 perfect coppers and one thats rotten. You just never know around here. The good news is the old yards have old coopers to find! HaHa