You can enter the sweepstakes and play a weekly instant win game by pressing the money sign in the lower left corner while in the app.
This is the compensation package you will receive, it's a PDF of a briefcase. You can print it out, put it together and point your camera at it while in the app, or you can just point your camera at this image now. It will work either way.
Touch here in the app to pick up Archer's war journal. This is the mystery item on the list.
Point your camera at this Archer Dreamland poster to see it come to life. Then, touch the flask Archer is holding to add it to your inventory.
Next, point your camera at this image of an American dollar bill, or point it at one in real life if you have one for more fun, to add money to your inventory.
The last thing you can find for now is these leftovers. Point your camera at this app poster and take the leftovers from Lana to add it to your inventory.
Here is a video of the assembled briefcase in the app.