Hi there and welcome Sean
What is the exact message you get when you try to sign into these boxes?
Please let em know
ok, due to privacy and security reasons, closure dates are not kept on the mail boxes but if a mailbox is not used for 6 months (signed in) it can be closed at any time within the following 3 months.
So you can estimate they were closed within 6 - 9 months of you last signing into them Sean.