I did that years ago with my 1981 Chevy LUV. I think it may have been my first time at the scrap yard, so I had no idea of protocol. I went inside and asked about getting rid of it, and the guy said unload it over there. I then asked him about getting weighed, and he was like "oh you want money for it?". I think he saw the small load in the box, and didn't understand I was leaving the entire box. I got the truck weighed, drove over sorta near the crane/magnet, pulled the lights, threw the scrap on the ground, and then my friend helped me lift the already unbolted box off, and got reweighed.... I wasn't giving the yard $14.00 of free scrap (and lots of cracked bondo)!
My friend told me he never felt so ghetto in his life riding home in my truck with no bed.
My truck was also white.