I would unpack it very slowly.
First I check for dents, and then slowly unpack the delivery slip, read it in a whispered tone.
Then I would run my fingers along every seam, looking for the places where I could separate the tape without being rough on the package.
Then I would very slowly unzip the flaps where I know there is another layer of protective material, keeping the precious object out of sight and reach a little longer.
Then I would slip it out of the box, slowly and carefully removing the remaining packaging.
Then I would attentively undo the zipper/unfasten the clasps.
Finally, I would examine every surface and curve very closely, and then plug it in and take it for a drive at slowly increasing volumes, playing with each knob and button until I am fully satisfied.