Proof of what? lol They just answered to the person claiming that is rigged that is not pre-picked in the sense that you can't program that. If you want to program show all these option but always give "Y" I guess you could. But then everyone would get the same fixed reward becuase you told the game that is the only one possible.

Now if you want multiple items, you need to code in that anyway, if there's two to pick from you can give each 50%, if its ten then it can be 10%. If you want you c*so code it in a way that some items have a higher percentage like you'd have three one can be 20% the other 30% and the last one 50%. You're basically telling the game this is the one I want to fall the most and this is the one I want to fall the less. Still like you said it "some people get lucky some people doesn't". It won't change that some people get what they want in their first try and other people don't. Now, no one has said it has a specific percentage smaddeus merely brought 5% and 50% as examples, you'd know that if you had actually took the time to read well and understand what they wrote. You really couldn't say what are the specific percentages unless you look at the code.