Hi there and welcome
It is very likely it is stolen and this is why you have this lock. Its common now on ebay to get these locks when they are stolen.
Even calling Apple Chris will not help, they will never unlock it. The only way to unlock it is if the original owner signs into it, I can promise you on this as I deal with this a lot.
Your welcome to call Apple On 1-***-***-**** but they will confirm to you what I am saying.
With this issue, they will not even see the owner.
Unless you can get the original owner to unlock it, you have an expensive paperweight sorry Chris
If you would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.