4x4 Evolution Easter Egg - Secret Treasure Chests.

Go to the island track that has a big washed up sunken ship on the shore. There is a small hole in the ship you can just barely drive into. You can get a little treasure chest that has a random amount of money.

Also in the farm track, under the lake, if you drive around enough, there is another treasure chest. These chests appear to be useless but are secret eggs to collect for fun.