It might be worth getting a sample of or going to see any green waste compost before you buy a big load.
From personal experience I bought a lorry load of certified organic compost and its full of shredded pieces of every kind of garbage you could imagine. Which shows up more after rain has washed off the compost from the bits.
The reply I got from the company was that it was under the standard they have to meet.
Luckily I was going spreading it by hand so I noticed it straight away.