3 large OPEN tins of F&B paint (NW5 Kentish Town)

Three large tins of Farrow and Ball paint. They were at the property I am renting when I moved in. All were OPENED. Two are full and one feels half full. I am not sure if they are still usable. Thought I'd put them on here, before dumping them. Please confirm when requesting that you have read this, and are aware of the condition.