I have obtained 5 more sets from here. 3 chip sets. HS and in very good shape.
The casino was open from 1981 to 1983. The chips are 1, 5, & 25 Niras.
There is also a business card from the Vice President of the casino with each set. I had 5 sets of these a while back, and they went fast.

I paid $10 for each set. Will trade for $10 in chips or sell for $10 plus $1 postage.