Unregistered 2nd-hand Euphonix MC MIX, is it normally unregistered...?

I am about to purchase a 2nd hand Eupohnix MC MIX (not Avid Artist mix) mk1 to try Eucon on my cubase but the owner says he never registered his and worked fine on his PT…

Would I be safe…? He said he was not the first owner and it did not matter to him.

Sorry to bring up Eucon issue here.