Kokua Line: Is trading OK on 3-cart garbage routes?

Question: It is OK for Oahu residents to trade or share gray, blue and green bins? In other words, if someone has an extra green bin they don’t use, can they just give it to someone who calls dibs on Facebook? Or, if an avid recycler doesn’t generate enough trash to fill their gray bin, can they give it to the large family who lives down the street?