concepts: attach box key open use
target: The box had a key attached to it for the man to open and use the contents as directed.
references: The box had a key attached to it for the man to open and use the contents as directed. A man uses a key to open a box and attaches a note inside of it. You should use the key to open the mail box and attach it to your key ring. The key that is attached to the box can be used to open it. A person tries to use an attached key to open a geocaching box, but no luck.