I haven't posted in a while, but where else do you go when you need advice 
I have recently sold a carseat on eBay, which was listed as collection only with cash on collection - no problems so far except that the winning bidder lives 150 miles away from me.
I have sent my address in an invoice, twice, as I know that you shouldn't provide contact details through the messaging system.
The buyer has said that "a friend" will come to collect the item and will pay when they collect. I have given a time that we are available for collection, and have asked for details of who is coming to collect as I want to ensure that I am giving the seat to the correct person and also want to get them to sign to say that the item has been received and in good condition.
So far, the time is not convenient and "the friend" wants my contact details so that they can check whether we will be in. However, the latest message that I have received from the buyer is that "the friend" is a courier. I have responded to ask whether they are collecting as a friend or a courier, and am waiting for a response.
I have no intention of waiting in all day, and can't due to other committments anyway. So, the reason for my post is to ask for a bit of advice really. What is my best course of action next?
Thanks in advance.