Hi!
According to Ellis Island's data, some Jacob Mazurek (without "Joseph") arrived to USA on May 10, 1905, aged 24, which means he was born in 1881 - the same year, you've mentioned. In the passenger record his place of residence is stated as Sanok. There are a lot of materials in Rzeszow state archive - department in Sanok for this time period. Do you possess some additional information, such as J. J. Mazurek's confession? It would be helpful in finding proper documents.
Just in case, you can write me on
mich.papiez@gmail.com.
Regards!
MichaĆ