I think the person you sent them to, hasn't picked them up. I have some old ones too. Sometimes you have to alert the person you are sending them to so that they know to pick them up out of Private Messages. Not everyone is set up to get a notification there is a message in their inbox.
Hope this makes sense.
There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.