Can i store filament flat in the original box, or does it have to be stored vertically on edge? I’d like to vacuum seal rolls and put them back into the shipping box.
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They’ll be fine lying flat as you are planning. But saying that: they’ll not get better if you allow them to age (too much) 
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Do be careful that is all wet, otherwise if partially wet, the water will be drawn by gravity so you will have one side wet filament and the other one dry
But store it with spools standing up and the water flows to the bottom and spools can require a computer balance at your local tire store before you can use them.
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No problem. Just print some weight blocks out of lead PLA and stick them inside the spool…
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OK, then. I guess I’ve learned one thing with my first post - you people have a sense of humor. 
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