NEW TOPIC HERE: http://www.kongregate.com/forums/60-anti-idle-the-game/topics/314911-mystery-box-contents?page=1
General: All prizes with the same color scheme have the same chance of being given.

Cost: 350 Blue Coins
Available as bulk-purchase: Yes (200 boxes, 65.000 Blue Coins)
Chance to get any prize from each color category
Yellow: 0.2%
Green: 1.5968%
Blue: 98.2032%
Chance to get a specific prize from a color category
Yellow: 0.2%
Green: 0.3992%
Blue: 2.9759%

Cost: 500.000 Green Coins / 1250 Blue Coins
Available as bulk-purchase: No
Chance to get any prize from each color category
Grey: 90%
Purple: 9.9%
Yellow: 0.1%
Chance to get a specific prize from a color category
Grey: 90%
Purple: 3.3%
Yellow: 0.1%

Cost: 1000 Blue Coins
Available as bulk-purchase: Yes (100 boxes, 95.000 Blue Coins)
Chance to get any prize from each color category
Bright red: 3%
Dark red: 14.55%
Dark blue: 61.838%
Bright blue: 20.62%
Chance to get a specific prize from a color category
Bright red: 0.6%
Dark red: 1.455%
Dark blue: 4.417%
Bright blue: 10.31%

Cost: 5000 Blue Coins
Available as bulk-purchase: Yes (20 boxes, 95.000 Blue Coins)
Chance to get any prize from each color category
Grey: 100%
Chance to get a specific prize from a color category
Grey: 8.333%

Cost: 200 Blue Coins
Available as bulk-purchase: Yes (500 boxes, 95.000 Blue Coins)
Chance to get any prize from each color category
Yellow: 0.3%
Dark Yellow: 0.997%
Bright Orange: 2.961%
Dark Orange: 6.702%
Orange Red: 13.356%
Red: 22.705%
Dark Red: 52.979%
Chance to get a specific prize from a color category
Yellow: 0.3%
Dark Yellow: 0.997%
Bright Orange: 2.961%
Dark Orange: 6.702%
Orange Red: 13.356%
Red: 22.705%
Dark Red: 52.979%

Cost: – (Free from Daily bonus)
Available as bulk-purchase: -
Chance to get any prize from each color category
Yellow: 100%
Chance to get a specific prize from a color category
Yellow: 10%

Cost: 700 Blue Coins
Available as bulk-purchase: Yes (100 boxes, 65.000 Blue Coins)
Chance to get any prize from each color category
Yellow: 1%
Bright green: 4.95%
Dark green: 94.048%
Chance to get a specific prize from a color category
Yellow: 0.5%
Bright green: 2.475%
Dark green: 5.878%

Cost: 750.000.000 Yellow Coins
Available as bulk-purchase: No
Chance to get any prize from each color category
Dark purple:0.03%
Medium purple: 2.9988%
Bright purple: 96.971%
Chance to get a specific prize from a color category
Dark purple: 0.01%
Medium purple: 0.4284%
Bright purple: 6.9265%
Correct as of v 1504, 2012-11-05