Exactly. Who knows, he might, he might not, but no evidence states that he knows of the Riddle/Voldemort connection.

 

Again, is there any evidence in canon of it being illegal to have two wands or is this just a fanon thing?

 

It must do surely. I mean if there original wand was destroyed, they could get choosen by another wand. In fact, even if you first wand wasnt destroyed, why could another wand not choose you. I mean if Harry treated wands like he seems to treat Goblins, they would flock to him...