Costco Wholesale Canada told customers who bought certain Peace by Chocolate gift boxes online to stop eating two pistachio-containing chocolates, after an ingredient supplier triggered a warning over possible Salmonella contamination. The “voluntary, precautionary” recall covers Our Classic Box – 15 assorted filled chocolates and The Harmony Bar included in Peace by Chocolate Small and Medium Bestsellers Boxes purchased on Costco.ca between Sept. 7 and Dec. 3, the notice showed.