I’m wondering if they sold the gates to someone else?
Everyone on here is right, they need to return the gates or pay for the ones that are on exterior fencing. And Friday, everything is off your property, or you remove it from your property before the sellers leave your property. You are not storage, and they have no right to turn you into a storage unit. What happens to their property is not your problem, as long as it’s not on your property.
I would also have some help standing by to supervise them leaving, and take photos of anything they leave behind, or any damage they do. Actually, I would go by your property and photograph everything showing the condition of the property, the missing gates, and anything that is left behind. No matter what they say about another trip, or leaving something for later, make sure you have a witness when you say no.
Don’t make any concessions about anything for these people. I don’t care what their issues are, they don’t leave anything, and you give them nothing.