From time-frame you are looking for there are only marriages until 1872 in Przemysl state archives and births until 1897 in Sanok state archives. There are a lot of earlier records. Later records perhaps only in Komancza civil registry office.
There is also a kadaster map in Przemysl state archive from ~1850. I do not remeber if they have a table of house and land owners for that map but I think they should. If they do then you could find the exact place where the people you are looking for used to live.
I've been to Łupków a few times and I am going there in the end of January so may take pictures if you wish (the old village does not exists except the railway station, one old house and a few graves in the cemetery). There are about 3 or 4 new houses.