Madam Bones comments: Clues of Harry's protection?

[uniquebeauty_177]

No: HPFGUIDX 145383

Hi everyone I'm new and it's my first time posting so forgive me if
this has been discussed before. I tried searching for it in the
messages but couldn't find anything.

I'm wondering about the significance of Madam Bones comments in
Harry's hearing in Book 5.

 " "We have no record of any witch or wizard living in Little Whinging
other than Harry Potter," said Madam Bones at once. "That situation
has always been closely monitored, given...given past events." " 
( OOTP, pg 143 US, Ch 8)

What exactly did she mean by "past events"? How big of an event or
events was it that it had to be "closely monitored"? Was Harry going
to live there the event? I don't think so. I think it has something to
do with this passage from book 4.

 (LV talking) "But how to get at Harry Potter? For he has been better
protected that I think even he knows, protected in ways devised by
Dumbledore long ago, when it fell to him to arrange the boy's future.
Dumbledore invoked an ancient magic, to ensure the boy's protection as
long as he is in his relations' care. Not even I can touch him
there...."  (GOF, pg, 657 US, Ch 33)

IMO, DD did very big and important magic at Privet Drive before he
took Harry there. And because the books say "ways" and "events" it was
more than one single piece of magic. Enough to get the Ministry
involed. It would explain the time thats missing from LV downfall and
Harry showing up at the Dursleys. 

Also, how does LV know that he can't touch Harry there? LV's been
"less than the meanest ghost" since that night he tried to kill Harry.
So who told him about the ancient magic? Given the two passages and
the few people LV came in contact with since that night I think it was
Bertha Jorkins who told him. She would have known all about it if the
Ministry had been monitoring that place since before Harry went to
live there. 

What was the ancient magic, if any? How does this tie in with Book 7?
And DDs story? I just wanted share my thoughts and ask everyone elses. 

--Monique