I don't think it was Mr Sears or Mr Roebuck that came up with the idea, One of their warehouse managers I expect. I always sort of wonder why Sears did not become what amazon is, They already had the infrastructure for it. my best guess, unable to shift mediums fast enough?
While looking for sources to this story(I could not find any, sorry) I did find a claim that bezos was pivotal for a 1992 ruling that no sales tax was due for orders that originated outside the state. and this was critical for amazons early success. I worked for a mail-order company when that ruling was overturned. And it was a mess, I was not in accounting so I have no idea what it did financially, but all of a sudden all the software went from having to handle (in state collect tax, out of state no tax) to (every state, county, city and their dog charges a different tax and now you have to try to figure out what this is and collect it).