Forget the broker, You, or the Buyer, can deal directly with your local UPS store. Canada UPS will coordinate with USA UPS.
Drop by with photo, dimensions, weight, value, insurance amount. They will give you a price to package them for you and ship them, they being responsible for damage prevention.
They can give the price to the buyer who can pay UPS directly, his credit card, then any seller’s fee, taxes, are reduced or transferred to buyer.
Once arranged, take condition photos, include set of photos , simply drop off with the UPS people.
I just did it successfully.