Even if you delete everything, the storage capacity will not decrease.
Please check
Question
Please check the capacity
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Please note that the accumulated storage and/or number of files will be updated and may take up to 24 hours to be correct. If the issue remains unresolved after 24 hours, please inform us and we will investigate further.
For reference, you can visit this article: https://support.box.com/hc/en-us/articles/360043695334-Storage-Usage-Or-File-Count-In-My-Account-Is-Incorrect
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