I agree that if you are shipping the 30# box directly to the consumer, you should include ingredient statement and nutrition facts printed on a sticker affixed to the case. If you are putting that case into another shipping box, you could affix an insert with the information (tape it?) or if it is the only case in the shipping box the insert could be loose.
"Should" or "must" are different.
If adding leaflets to each box manually becomes too burdensome, or even more important, you aren't confident that you'll get the right one in 100% of the time, its good to know if its even required in the first place. I don't know where nuts stand in relation to the FDA/USDA and their regulations, but if they are indeed "raw fruits and vegetables", I would maintain that an online copy is enough.
You could however add a QR code to the case as a direct link to the nutrition facts. If you don't want to be stuck with nonconforming inventory if something changes, or stocking preprinted cartons for each SKU, another option would be for the CQ code to link to a page that allows them to search your products.