Claim a financial compensation
First of all, REMEMBER NOT TO THROW YOUR STICKERS AWAY and this even after the game is finished! Why? Because they are proofs of your participation to McDonald's Monopoly and you will need them if you intend to claim a financial compensation.
How much might you be able to claim?
Probabilities can be very tricky. The indemnisation amount might be different from one country to another based on the national laws of your country. Because McDonald's rigged the game, you don't know what stickers you would have gotten with an unrigged game. The legal concept of "loss of chance" applies. You therefore must try to determine how many stickers of each you would have gotten had the game not been rigged.
McDonald's deliberately misled the consumers into believing there were as many stickers of each property. The fact that in some countries, like the United States or Canada, they mentionned in the fine print the real odds doesn't matter because it's contradictive with the overall advertising message McDonald's wants you to believe which is that it's a collection game.
If you have 26 stickers or more :
McDonald's displayed Monopoly game boards with 26 distinct properties. Therefore, they wanted you to believe you had 1 chance out of 26 to get any of the 26 properties. This is the number to retain : a probability of 1 in 26. Remember that we are talking here in terms of legal point of view. When there is a "loss of chance", the courts decisions will be based on the theoritical numbers.
Therefore, imagine you have collected 58 stickers. With an unrigged game, how many of each property should you have gotten from a purely theoritical point of view? Let's assign a letter to each of the 26 property names, from A to Z. With 58 stickers, you should have collected
58 * (1/26) stickers A.
58 * (1/26) stickers B.
58 * (1/26) stickers C.
58 * (1/26) stickers Y.
58 * (1/26) stickers Z.
In other words :
2.2307 stickers A.
2.2307 stickers B.
2.2307 stickers C.
2.2307 stickers Y.
2.2307 stickers Z.
2.2307, therefore you round down the value to 2. With 58 stickers and an unrigged game, the court will consider that you should have gotten :
2 stickers A.
2 stickers B.
2 stickers C.
2 stickers Y.
2 stickers Z.
In case you would think that a probability is not a certainty, we perfectly agree. Indeed if you flip a coin twice, you are not sure at the 2nd flip to get "tail" if in the first flip you got "head". But you must understand that a court will determine your loss of chance based on probabilities, and probabilities are theoritical.
If you wonder how to determine the numbers of stickers you should have gotten if you had 25 stickers or less, it's much more complicated :
Between 2 to 6-7 stickers, we could use a computer simulation to compute all of the possibilities and calculate the exact average.
Between 8 to 25 stickers, we must use a computer simulation to simulate the average prizes' worth of what you should have gotten with, say, 12 stickers for example. For instance, a software will pick randomly 12 stickers. To have a good estimation, the simulation software will repeat this operation 1 million times. It will then make an average of 1 million simulations and you will end up with an excellent approximation of what you should have earned, in average, with the 12 stickers.
No matter what, we strongly advise you to stop playing to this "game" which is a scam.