Question

How can I access archived private messages using Facebook’s Graph API?

https://graph.facebook.com/me/inbox seems to return unarchived messages only.

Answer 1

So the deal (apparently) is that archived messages are simply not available VIA the api. Whether this is a bug or not is yet to be determined.

You can see this behavior by querying a specific message by it’s ID in the API Explorer, then archiving the message through Facebook. Returning to the Explorer and querying the same message yeilds the uber generic and much despised "Unsupported get request".

{
  "error": {
    "message": "Unsupported get request.", 
    "type": "GraphMethodException", 
    "code": 100
  }
}