Originally Posted by
Heath
Originally Posted by
Kirobaito
R.A.B. is obviously Regulus A. Black. I hope that everybody realized that.
I don't believe anyone, other than Slughorn, Dumbledore and Harry had any idea that Riddle planned on creating/created Horcruxes, and it would seem a little out of the way for Regulus to go hunting for something that would appear to have been a worthless item.
What do you mean? Here's a copy of the parchment:
To the Dark Lord
I know I will be dead long before you read this
but I want you to know that it was I who discovered your secret.
I have stolen the real Horcrux and intend to destroy it as soon as I can.
I face death in the hope that when you meet your match,
you will be mortal once more.
R.A.B.
Whoever replaced the Horcrux already DID know of their worth. Sirius wouldn't have been aware of Regulus's actions when he called him a coward. He was only aware that Regulus "backed out" and was killed. He appeared to have very limited knowledge of Regulus's fate - it's entirely possible that Regulus destroyed it, then appeared to flee the Death Eaters and was then killed. That would make him look like a coward, even though it was a noble deed.
Additionally,
Originally Posted by
Order of the Phoenix, Page 116, American edition
…also a heavy locket that none of them could open
That was taken from when Harry was cleaning in the chapter <i>The Noble and Most Ancient House of Black</i>. Interpret it how you want.