Should additional items be included 'unless otherwise stated'? Used camera issue (Buyer's claim)

I recently sold an olympus Pen camera on this site.

 

Buyer has received the item but is now opening a 'case' as I didnt send the USB cable, ops manual or software disc.

 

My description stated that the camera body included a battery charger, batter and original flash.

 

His argument is that the usb cable, ops manual and softwared disc should have been included with the used camera unless stated otherwise?

 

What the?