Back then you had various glossy magazines around, complete with a classifieds section in the back.
Apparently one use of those was to offer a like for like copying service. Meaning that you put up an ad and people would mail you floppies of various games and software, along with a list of same they hoped to get in return.
Apparently it eventually snowballed to the point where he had invested in a second floppy drive just to speed up the copying process, and ended up spending whole weekends switching floppies and stuffing envelopes.
Eventually he got so fed up he started returning envelopes unopened.
Secondly, i think Amazon accept Fedex-ed HDDs for their cloud services. In case the amount of data to be uploaded would take unreasonably long otherwise.