Harry heard his footsteps long before he saw the black robed figure enter the far side of the Chamber of Secrets. He waited patiently as Voldemort climbed through the opening and made a gesture with his wand and twenty feet away and in front of Harry another squashy chair appeared.
"Good evening Tom" Harry said easily. "Won't you sit down?"
Voldemort looked at up at Harry uneasily and surprisingly enough bowed his head and sat down across from him. "To what do I owe this pleasure Tom?" Harry asked.
Voldemort blinked and had a feeling of reliving a moment and then looked up at Harry and sneered. "You can call me Tom if you'd like Harry if it'll make you feel better. The rest of the world knows me as Lord Voldemort though."
Harry grinned. "Not this year Tom. I was a student teacher this year did you know that? Did they have those in your time? No? Well I quite enjoyed teaching the other students this year. We covered quite a bit actually. I even gave a history lesson this year about you. You should be quite flattered. I made you seem much nicer than you really are you know." Harry said.
"About me?" Voldemort asked. "And what would you really know about me Harry Potter? Ah Dumbledore of course. The meddling muggle loving fool, did he tell you all about poor Tom the orphan?" Voldemort sneered. "Did he tell you that he caught me stealing from the other kids there?" He asked and there was contempt in his voice.
"I actually saw it with my own eyes, well through a memory. Oh yes Tom I've seen a lot of your escapades through memories, even through your diary." Harry said. "You really should have trusted no one with a Horicrux Tom." Harry said and reached inside his robes and withdrew the fake locket he and Dumbledore had retrieved and pitched it to Voldemort who caught it deftly. "Go ahead and open it, it doesn't bite. It will surprise you though." He said.
Voldemort opened the locket and took out the small piece of parchment and unfolded it. As he read it his eyes became slits. "Regulus Black" He said through gritted teeth as the paper burst into flame in his right and the fake locket turned to dust in left. "But how did he find out?" He asked and Harry knew he was talking to himself.
"I would hazard a guess that he knew a bit of Legilimacy. In a weak moment as your thoughts were elsewhere he might have seen. However it happened he did find out. Once I destroyed the diary/Horicrux it was just a matter of time before Dumbledore realized what it really was." Harry said answering the question anyway.
"And the rest of them?" Voldemort said looking up at Harry.
"I wish I could take credit with all of them really but I can only take credit for one and even that was luck. Dumbledore found the Ring and Severus Snape found all but the Griffondore Medallion. Mundingus Fletcher found that at your fathers house." Harry said. "Severus destroyed it at Grimmald place last summer. Pity you had to put them into the founder's relics. They should have been on display in the Trophy room." Harry said. "Oh and by the way we had your trophy for services to the school destroyed Tom. I'm sorry but considering the circumstances you understand." He said sadly. "Murdering a student with the basilisk and framing Hagrid wasn't nice Tom." Harry said and continued to sit and stare at Tom with a sad look on his face.
"So you think you have beaten me already do you Harry?" Voldemort asked in a sickly sweet voice.
"No Tom you beat yourself along time ago." Harry said.
Voldemort looked past Harry at the perch. "So the old fool passed the phoenix down to you did he?" Voldemort asked.
"You cannot pass a phoenix down to another person Tom you should know that. Phoenix's bond with whom ever they choose. A phoenix is a rare magical creature Tom. If killed they can never truly die." Harry said shaking his head.