Snape finding Lily's Letter

[allies426]

No: HPFGUIDX 174208

--- In HPforGrownups at yahoogroups.com, "potioncat" <willsonkmom at ...> 
wrote:
>
But the other question 
> should be, "How did Snape know to look for it?" Then I realized, 
> Snape had already seen the letter, and so did we. It's mentioned 
in OoP. Here's the [canon]. 
> 

Allie:

Talk about the needle in the haystack!  If that was JKR dropping a 
hint, that was her most subtle yet.  HBP 518 The exact text reads:

". . .  Sirius and Snape both seated at the long kitchen table, 
glaring in opposite directions.  The silence between them was heavy 
with mutual dislike.  A letter lay open on the table in front of 
Sirius.  'Er,' said Harry to announce his presence."

Now that you've (brilliantly!) pointed it out, yes, of course, it 
must be the same letter.   (At the time maybe we thought it was a 
letter from Dumbledore to Sirius explaining the situation?)

Yet more proof, HP fans are smart.  :)