Delete a Message
Didn't you read the message I posted just above? 
If you need to access older messages, at the bottom where you have the list of pages you also have the range selection, 3 months by default, but it can be extended to what you need, in case you need to go further in the history
Small update: now by default comment search is limited to the last 3 months.
This can easily be changed from the search page or at the bottom of the results page.
This can easily be changed from the search page or at the bottom of the results page.
If you need to access older messages, at the bottom where you have the list of pages you also have the range selection, 3 months by default, but it can be extended to what you need, in case you need to go further in the history