I think that you're labouring under a whole heap of mis-information. Arms are granted to a person, not a name. It's a pity that the arms you are looking for aren't SMITH or one of its derivatives - there're over 500 arms registered in that surname and, as the number indicates, they are registered for people, not the surname.
My initial search hasn't produced any arms registered in the name STAFFIERI, but I will keep looking and if I do find any, I'll post them here.