Northeast Las Venturas.
thanks ill check it out too.
Those floating boxes are misplaced objects by Rockstar programmers. They can't just put them exactly inch-by-inch on the ground. It'd take lots of measuring to do so they put it floating a little on the air. If you play SA:MP, solving that floating problem theory is easy : misplaced intentionally. Case solved.
I checked that place too, I found 3 floating boxes. In my opinion it's just a glitch.
In my opinion, it isn't a glitch, can be clearly seen as intenionally placed in air.