Hello :)

While I may not be of much help in other areas, I 
can place your FY cels for you:

Chichiri: TV episode 51 (I have the one right 
before yours in the sequence...the art from this 
episode is absolutely beautiful. :)

Tasuki & Chiriko: OAV II episode 3 (If you want 
to sell this cel, please let me know...I always 
kick myself for missing this one at Nancy's)

Chiriko & Chichiri: OAV II episode 6 (I'd be 
interested in buying this one too. ^_^;)

Miaka: OAV II episode 4 (Tasuki's seduction of 
Miaka)

Hope this helps you out some. ^_^

-Ryouko