I would say most of them are lying - we're Monday now, nice and easy to delay someone until Thursday before they can complete the deal.
Otherwise the only way would be "insider". I mean, if you're working for a retailer and you've decided to take a console early - well I guess you gotta decide if those few hundred quid are worth the potential of losing your job.
I've seen people risk their job for a punnet of raspberries so I don't doubt people will do for more.