When it comes to shipping guitars I"ve always been meticulous at packing. I usually slacken the strings, fill any empty areas in the case and then pack the case with several inches of bubblewrap before boxing it. Lately I've noticed more guitars simply being stuck in a box (in their cases of course) with full string tension. Have I been the anal retentive guitar shipper this whole time? Is it necessary to slacken the strings or have redundant wrapping when the guitar is in a form-fitted case?