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Ex- Morocco buried carts/palm trees, Alaskan Summer buried sleds/runied teepees, Long Island abandoned clubs etc...
I think it depends on how far along you are with playing the farms ... usually they are able to be used once the farms are superceded by a few newer farms
A while back they stated that any farm that is older than the 7 latest Farms SD Boxes would open treasures etc, but that no longer seems to apply.