Exactly! I'm just selling the gas! Maybe a prospective purchaser would like to use up the gas and then return the empty canister to Calor? This is what I tried to do this afternoon, but Calor sent me on my way with another full bottleI take it your selling the gas not the bottles as the bottled don't belong to you but if you have the original paper work and can prove ownership you can return them to calor for a full refund.
other wise you cannot sell someone else's property.