White Van Speakers ?

Anyone heard of this scam. I guess people go around town
and try to sell "left over from an install" products for "cents on the dollar" only to sell people junk! Seams
like it would hardly be worth the effort, but i have had
guys pull up to me in traffic and say the have nice speakers
for sale. I guess these are made in china for like 5 dollar a pair? I cant see too much harm IF you know audio and dont pay too much. I know, my local Craiglist often has unknow speaker brands pop up all the time, and if i do a google, it always goes to a web site about White Van rip-offs.

Anyone else have knowledge of this and can explain the supply chain a little more?