Horcrux in the office?

[Chys Lattes]

No: HPFGUIDX 143571

I was thinking back on something we'd talked about before and I was 
wondering if there really wasn't a horcrux made in the office when 
Harry saw the memory of Voldemort wanting a job at Hogwarts, and the 
little twitch of his hand? 

Well, I figured that perhaps the memory was exactly as DD remembered 
it- but that he had been stupified/obliviated/memory tampered with 
like LV did to the house elf and Morfin, or something similar, while 
LV made the horcrux right in that office, either from the hat or the 
sword or something unknown of value there, as well as placed the 
curse on the job at the time. 

On how to do it- well, why couldn't he have killed Fawkes to do it? 
No one ever said it was just a human life taken that rips the soul- 
it said 'killing'. There was no mention of the state of the phoenix 
at the end of the memory, only at the beginning where he was 
slumbering happily. Perhaps DD would have turned around after the 
interview and believed it had just been a burning day, when actually 
Fawkes had been hit by the AK (as we've seen in the OotP, he's just 
reborn again.)

I don't know if anyone mentioned this possibility before but if you 
have please direct me to the thread where the conversation took place!

Chys