Is it possible to tell if a chocolate is fake (with vegetable oil) or real (cocoa butter)? Are there any tell-tale signs to look out for when looking at chocolates without labels? A baking supply shop I go to comes with HUGE blocks of chocolates that have been re-packed, so it has no label. I tried asking one of the clerks, but they were unsure as well.

If it's not labeled, don't buy it. Here in the States all items for resale MUST be labeled or it can't be re-sold. So it being unlabeled means it's probably brown hydrogenated vegetable oil and wax from some country that is known for counterfeit stuff.