Copying From Old organization Box account to new Organization box account

Good afternoon,

I work from an organization that recently separated from its parent organization. The old parent organization has a Box account. We need to copy all of our files from the parent org box account to the new org Box account without removing them from the parent org's Box account. This is about 4 TB worth of data and hundreds of thousands of files.

I've looked at transfer ownership, but that looks like it would remove them from the parent org's Box.

Downloading from the parent org and uploading to the new org isn't realistic because of the size of the folders.

I looked at Shuttle, but it doesn't have a box to box option.

What is the quickest way to copy that much data from one Box account to a new Box account? The files must be in both places and neither org will be a collaborator on the other when it is finished.

Thanks in advance.

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