I haven't known any untruthful flashdrives, until just recently when I purchased a 4.0 gig non-brand drive. I usually make sure I get what I purchased, so when looking capacity up through right click...
When buying... 1. ...always know you can pay for that item. Don't say, "I will pay a week later." Keep it safe: pay immediately or as soon as possible, just like those auctions where "payment immediately"...