The info I would like is just to see it before purchasing.
For weapons you could line them up on the ground and take a screen shot.
For the music, was one of the 17 tracks the one in the trailer?
An easy way to show them off might be to take 6 or so seconds of each track, edit them together, and put that mp3 up, so people could get a feel for how it sounds.
SFX are harder to "show off". I'm mostly curious about the quality, meaning WAV or MP3? Bitrate? How good of a microphone was used for Foley, etc. (Like a little humming or buzzing might be easy to fix in audio editing software, but some sound clips are "unfixable").
I'm just speculating, at this point, because there weren't any sound in the video.
Just putting some thoughts out there, too help you make some sales.