Hi Linda, thanks for the response. I had thought about the odor contaminating the cards, but since I don't smoke I always notice any hint of the smell of tobacco. Surprisingly these boxes seem quite free of any tobacco odor. I wondered, when I got them, if they had ever had any cigars in them.
Also somewhat surprising, these boxes are not the typical size. They are almost exactly the same width as postcards.
What I am worried about is an acidic problem from the wood. I don't know what kind of wood they are made of. I have thought about getting a test kit to test the acidity.