Folks, this trick does not work anymore - the game publisher has since patched the game. For those of us who played this game since the early days, this used to work.
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Hi folks! Please excuse the background noise, I taped this while at the airport.
Anyway, I've been playing the Hay Day game for a while now and noticed something weird with the mystery boxes sometimes. There are a few friends' farms that I can repeatedly visit and each time I visit the mystery box shows up. Now that's not the weird thing, the weird thing is, sometimes the game get into a state that the mystery boxes will all open and return items...and sometimes diamonds too! I'm sorry but I don't know how to recreate this but I can tell you that I visit a couple of friends' farm over any over, if you start receiving unlocked mystery boxes then just keep on re-visiting these ...