Phenotypewise ("the look") is normal, but we (normally) can't tell you by the look of the animal if it is a quad het. Quad het. itself means, that an animal is heterozygous for four different traits. The label "quad het. amber" doesn't make much sense because an amber cornsnake would be homozygous for caramel and hypomelanistic. Therefore, a "het. amber" snake is just a double het.