A) "Sandy Hook" map in the latest Batman movie (lower left quadrant in black):
Here it is referenced in the actual movie.
B) Victoria Soto R.I.P. Page (dated 12/10/2012 - days before the shooting):
Here's the acquisition of the data above in a video:
C) United Way’s Sandy Hook School Support Fund webpag:
If you are clever and Google a bit you can still find sites linking to the United Way fund raiser dated from Dec 11, 2012.
I am not going to post the data here because then it will magically change in Google. The pages listed here all have this magical property as well.
However, the clever engineers at Google apparently don't know how their search engine works.
Good thing or this information would not be around any longer.
All of this is summed up nicely in this video: