I remember seeing some cels of Jaken and Rin from
I think episode 100/101 (??).  The one where Jaken
got stung by one of Naraku's bees and Rin went to
go find the antitode.  I thought it was all CG
too, but then I saw Anime Museum selling off cels
from that scene.  Below is an attachment of the
cel(s) I am referring to.  I hope the pictures
goes through.  

Star Phoenix