I am selling a bass to someone within the continental US (I am located there too), and including a hardshell flight case in the deal. The problem is, it seems like I'll have a tricky time finding a box big enough to fit a flight case! Would it be possible/wise to use the case AS the box and just put a label with addresses and stamps on the case itself? I know that the US Postal Service in general will ship anything that is reasonably shaped and doesn't have things hanging off of it. Has anyone else been in this situation? What did you do? Thank you in advance!