Someone has lost a set of keys. They are on a large tag that says, "Keys I haven't lost yet". You can pick them up at such and such machine.
The irony was not lost on me.
A few minutes later, the same person came on the loudspeaker again and announced
Someone has left a set of keys in the front break room. They are on a large tag which reads, "Keys I haven't lost yet." Well, you've lost them now and need to come get them at such and such machine.
I guess they're going to have to get a new keyring, now.