TORONTO, Sept 4: Thieves in the Canadian province of Quebec may have pulled off the sweetest heist of all time, siphoning off a reservoir of maple syrup from a warehouse and cleverly covering up their caper to evade detection, an industry group said on Friday. The warehouse in rural Quebec held more than C$30 million (30.4 million dollar) worth of maple syrup, a whopping 10 million pounds of the amber pancake topping. (AGENCIES)