How to win the lottery????

Hi all, it's my first post there(even first post ever) so I want that it would be a litle funny.A few months ago I saw behind bulding that I'm working in a big box with advertisement :'Guess what in the box and you can win a dream vacation' As person that never gained any prize in my entire life I was really curious what will be in the box, but how I can to guess???On the 'Box' I've seen an Url