Penetrating defenses/Knowing about Horcruxes

[mt3t3l1]

No: HPFGUIDX 138077

Here are more two things I can't figure out from the scene in the 
cave. Dumbledore is talking to Harry about LV and the potion:

"I'm sorry Harry; I should have said, he would not want to 
immediately kill the person who reached this island," Dumbledore 
corrected himself. "He would want to keep them alive long enough to 
find out how they managed to penetrate so far through his defenses 
and, most importantly of all, why they were so intent upon emptying 
the basin. Do not forget that Lord Voldemort believes that he alone 
knows about his Horcruxes."


First problem: Where do we see LV trying to find out how Harry and DD 
managed to penetrate through his defenses? They were able to get all 
the way back to Hogwarts with the locket and yet there was no sign of 
LV. We get to the end of the book, and we still have no indication 
that LV even knows that his Horcrux has gone missing. Perhaps LV's 
alarm system was inactivated after R.A.B. took the real locket and 
now it is no longer needed. But why would he inactivate the alarm and 
leave all the other protections in place? I keep expecting LV to show 
up at some point after/during the cave scene, yet he never does.


Second problem: If LV believes that he alone knows about his 
Horcruxes, how does this interface with his statement to the Death 
Eaters in the graveyard in GOF: "And then I ask myself, but how could 
they have believed I would not rise again? They, who knew the steps I 
took, long ago, to guard myself against mortal death?" Perhaps DD 
meant that LV is the only one who knows the *location* and *number* 
of his Horcruxes. But from LV's own statement, it appears that his 
Death Eaters are aware that they exist. [Which raises another 
question--have any of the Death Eaters made Horcruxes for themselves?]


The simplest explanation is that DD was wrong on both counts. LV was 
not interested in how his defenses had been penetrated (perhaps 
because he believed them to be impenetrable), and LV did not believe 
that he was the only one who knew about his Horcruxes.


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