Find my iPhone found my old mac that I sold should I erase it?

I sold my macbook air about three years ago and today I was setting up my new 6s and went to set up find my iPhone and it shows that mac as one of my devices about 400 miles away. I thought I erased it before I sold it but I guess not. So since he's using my find my iphone what else of mine can he use? And should I erase the mac to get him off my find my iphone? I have no way to get in touch with him.

IPhone 6s - What if you run out of space?

If you get an iphone 6 or 6s with only 16gb and later find you run out of space what options and solutions do you have?

Is there anything you can do other than delete Apps?

Why can't I find my order for iPhone 6s plus on Verizon?

My uncle ordered the iPhone 6s plus for me last Friday, he has to do it beens he's the account owner, and I'm only a member. But I have been wondering when to expect it so I know when to be home, so I logged into my Verizon online and searched until I found the orders page, but it says no future transactions, no rescent orders, and no history. Shouldn't the iPhone be on this list? Or does it mean somehow the order didn't go through?

Tell the difference between an iPhone 4 and 5?

My mum has been using an iPhone 6 plus for a year now and can't tell there difference between iphone 4's and 5's because they're *tiny*. I have the 5. The other day she was talking about phone cases and referred to my family friend lady's iPhone 4 as an iPhone 5.

How long does it take for the money to get into my bank account?

I just sold my iPhone on eBay and I checked my bank account to see if the buyer has paid but the money hasn't been put into my account. How long will this usually take? I have my bank account details on my eBay account as I do not have a credit card and they paid with PayPal. How long will it take for the money from their bank account reach into my bank account? Please help because I want to ship this as soon as possible.

Why isn't the iPhone 6S Plus in stock in my city?

Today I drove to many stores in hopes of finding a 64 GB Rose Gold iPhone 6s Plus, but every store i went to didn't even get the 6S Plus in stock today. Some of the workers said that Apple hasn't fully released the 6S Plus yet but what exactly does that mean?

Thank you

Added (1). Every store I went to didn't even get the 6S Plus in stock today. It's not about them selling out, it's about them not getting any of them from Apple.