From the looks of your website you don't do the boxing up of the items but simply handle notifying the carrier of where and when to pick up the already boxed and labeled item. The boxing and labeling is the part I would need someone in Miami to do for me.. Ideally, pick up the bike unboxed, take it to the UPS/FedEx store then box it there and ship it to my NC address so the seller does not have do do anything except check the receipt copy and hand the bike to your folks unboxed.
I guess I need a professional courier service (or a good friend in Miami) to do something like that??
Or a good bike shop. @FairToMiddlin did you have a shop you dealt with when you were in Miami?