Jaffa Clementines and AMC/Jaffa Grapefruit from Israel are being sold at Costco and other stores. These products may have Kedushas Shviis and it is recommended not to purchase them. If they have already been purchased, consult your local Rav.
Some products from Fruidles, the Dreidel Co. show an unauthorized Kof-K on the package. The Kof-K does NOT supply Kosher certification to this company.