original Norman Rockwell drawings?

Hi,

I just bought this pair of original pencil drawings at a local estate.
Yellowed paper with creases and damage (some tearing of the paper).

LOVE the boy and his dog drawings!

However, they are both signed "Norman Rockwell"...............
Can anyone tell me if they think these might be the real thing???

I can't tell. Sure looks old enough to be one of his works.
Pleas help?

Thanks,

Nessa