I've put together a list of the $2, $3, $4 chips from my collection. These are Nevada only ---- and they are not all drop chips. Some where used for other types of games, some used in limit poker games. I know I am missing the following:

Bellagio $3
Arizona Charles $4
Tropicana $4
Montego Bay $2

All four of these are truly drop chips and are toughies to get.

There are a few other of these denoms that I don't have
Palms $3 - 9/18 game (I have one there were two of them)
Palms $4 - bingo ellie
Palms $3 - bingo ellie
Silverton $2 - happy new year

The PDF is here: http://www.gaming-chips.com/temp/nevada_2_to_4.pdf