Possible that Chaim PRUSS was born in Simferopol, Ukraine even though the arrival manifest says Pinsk. Sometime during his childhood the family moved to Pinsk. I just wish that there was a PRUSS arriving to America from Simferopol to confirm something that the family was there.
Have you explored the birth record of the children that were born in USA? Should their religious baptismal record not contain parents place of birth?