The shine is no indication of them being stainless. Carbon steel will polish up like a mirror, just check the workshop gallery!
If it's a Henckels & it doesn't say Friodur, it's not stainless.
Stainless is a relatively new material for straights. The older ones are largely Filarmonica's & Friodurs & they're not that old really.
Do not fear the stainless. It'll hold an incredible edge. They may deliver a slightly less smooth shave, but i love them.