About Vulf Wolfson
His great grandson was born in 1849 and named Vulf, so he was dead before 1849. Since the great grandson had an older brother, Tuviya, born in 1843, it's possible that Vulf was still alive in 1843.
His son Iosel was born in 1803 so assume he was born circa 1783. So he would have been 60 in 1843.
Also, if he stayed in Courland and his son or sons emigrated to Novopoltavka in 1843, they may not have gotten news from Courland for several years.