This is already part of our wider business process, and I personally argue that the ASBA customer data prohibitions allow for this usage and/or can not prohibit saving detailed records of our business shipping expenses.
Some Sellers also duplicate all shipping data including tracking numbers into their own proprietary spreadsheet.
As long as customer data is used solely for order fulfillment and business expense tracking, is protected as PII by all available methods, and is not used for any advertising/marketing or demographic data collection, then my personal belief is that we are within our rights to retain it.
@Sundance thanks for the heads up! Was this a business/invoiced order, by any chance?