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I don't have prior experience with Box, but I can suggest:
write a script which will take 1 file and whenever new file comes, it will take its data and merge it into the previous one.
and connect that to tableau with the live connection
so whenever your new file comes up, the script will run, it will take the new data, paste it in old and then tableau will also show you latest data.
It depends on the format of the data that you are pulling from Box
but the usual approach to appending data to an existing Tableau data base is to UNION the data sets
see the link Union Your Data and look at Wildcard Union
also see Tableau Prep Tableau Prep as an additional approach
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