Is this a part of how he has been keeping an eye on Harry? (Dumbledore says to Harry, "... and I have watched you more closely than you can have imagined..." [OotP, The Lost Prophecy].) I am rather curious to know how Dumbledore had been watching Harry. We can rule out possessions, I think, because at this point, Harry didn't have anything that was his own.
pan_alchemistI would also like to point out that Harry's state of living did noticably improve with the arrival of the first letter. It makes one wonder why no attempt had been made earlier. As I said in chapter 1, Dumbledore knew what circumstances could have possibly influenced Riddle. Why take the risk with Harry?