Check the worlds file in C:\Users\your user name here\AppData\LocalLow\Mindblocks\Block Story\worlds. Any alterations you made to the world will create a folder, check these folders for any files with 3 numbers and .chest, example 32_1_27.chest. Once you find the chest files you should have a clue what chunk they are near. Just multiply the numbers by 32 in the chunk name to get a coordinate. Example 1_0_-3.chunk = coordinate 32_0_-96. Hopefully this gives you an idea of which way to go.
Conboy
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