Government has taken them hostage.
Your mission, should you choose to accept, it to steal these back.
I am writing you a detailed map of what you will need to to.
First, the building is located at 67 King William Street Level 21. You will need to use your cunning to get past the 65 year old security guard at the front door. He knows all the tricks in the book, and won't hesitate to call his local brigade of motorised wheelchair reinforcements to usher you away. Provided you have snuck your way past him, you will come towards the receptionist. This lass is quite the cutie, at 19 years of age, 5 foot 9, and a body that rivals Miranda Kerr's, you'll be hard pressed not to crack a fat one and run outta there. Best to say a quick hello, and glance at her, but if you do for too long, your body will do it's thing, and the mission will be deemed a failure. Once you pass the receptionist it's off to the elevator. Best not to take the elevator, as it may stall, and you will be stuck in there. Take the stairs, and watch out for the Sticker thief's henchman. They are packing some serious heat in the form 9mm uzi's. Deal with these guys as best you can, there should be only three or four of them. Once you have passed them, and you work your way to the 21st level, you will see a door on your right, saying 21st level. Be wary, as there is possibly a camera fixed on the door, and your attempt to infiltrate the safe will be foiled. Open up the door, and blast the Super Soaker i have equipped you with to short circuit the connection, and you can then work your way into the office. The office is 20 metres down the corridor, take a left, and it is office 28A. If you are lucky enough to reach the office, and 'the man' is not in, his safe is located in his wall, behind the painting of his dog, 'what is going on her'. The code is 24 67 27 11. Get this wrong, and ninjas will appear from the bar fridge under his desk. Steal the stickers, and run towards the flight of stairs outside of his office, this will take you to the roof, where with the parachute i have given you, you will jump. With any luck, you will be back on the forums, with some stickers, in time to watch forum member 'Hicko' get flamed for what he says.
Good Luck.