call his bluff...tell him you shipped all 7, tell him the weight for each individual item, and the total for all 7 items + box..say something to the effect that on my shipping receipt it shows the weight was 9 lbs, each package weighs 1.2 lbs, so theres no way a box makes up the differnece....then go to USPS website or wahtever, and calculate shipping for the package...make sure it matches your shipping cost....tell him to check the box out, and theres a label at the top corner stating the shipping price...he should look at that and verify the weight of the package...if he has any other problems...I'm assuming you insured it..take it up w/ the post office, and they'll refund his money..this is why I always have delivery confirmation and insurance just in case someone tries to jack me...they can track package was actually sent...and if for some reason something is missing, the post office covers it, so in effect, I don't care what happens to the package after I send it, becuase I've gotten my money and if I need to refund it to them i get it through the psot office. The other word of advice is insurance is calculated for every 50 bucks...so I usually insure something for 99 dollars if its 100...or 249 if its 250..it doesn't save much, but every little bit helps if you ship a lot.