RAB didn't take the locket, it was there in the bottom of the horcrux.
I believe that RAB is Dumbledore (likely the initials of a derisive name that Tom Riddle used to call Dumbledore behind his back) and that any similarity of the initials to "Regulus Black" is a red herring. I think Dumbledore actually put that note and the locket in the horcrux at some point either in the past, or by adding it in just before he conjured the crystal goblet and began to drink (probably while he was doing all that muttering and bespelling over it in the beginning).
In any case, the note and the locket were not really meant for Voldemort (why would Voldemort go digging around in his own horcrux looking for messages? Especially when he doesn't expect anyone else to find or have found it?) but ultimately for Harry, to let him know that horcrux had been destroyed (without tipping him off to the all-this-was-planned-between-D.-and-Snape thing). It was Harry who jumped to the (wrong) conclusion that Dumbledore had mistaken a false locket for the real one and not actually destroyed the horcrux at all. He'll figure it out in Book Seven, I'm sure.
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Date: 2005-07-16 09:13 pm (UTC)I believe that RAB is Dumbledore (likely the initials of a derisive name that Tom Riddle used to call Dumbledore behind his back) and that any similarity of the initials to "Regulus Black" is a red herring. I think Dumbledore actually put that note and the locket in the horcrux at some point either in the past, or by adding it in just before he conjured the crystal goblet and began to drink (probably while he was doing all that muttering and bespelling over it in the beginning).
In any case, the note and the locket were not really meant for Voldemort (why would Voldemort go digging around in his own horcrux looking for messages? Especially when he doesn't expect anyone else to find or have found it?) but ultimately for Harry, to let him know that horcrux had been destroyed (without tipping him off to the all-this-was-planned-between-D.-and-Snape thing). It was Harry who jumped to the (wrong) conclusion that Dumbledore had mistaken a false locket for the real one and not actually destroyed the horcrux at all. He'll figure it out in Book Seven, I'm sure.