HI,
I am still working on what Messages does with Saved Chats (Compared to how iChat 6 and earlier did it).
Previously iChat has a option to Save a Chat (which of course were IM chats only)
Messages beta took the option away and also started storing everything and storing them in a different place.
In iChat versions the default place was in your own Home Folder/Documents in a Folder called iChats.
Messages now stores the Saved items in the Home Folder/Library/Messages
both the iChat style IM chats and iMessages are saved in the Archive folder.
As you know you have to use th Finder and the Go Menu with the ALT key to access this (now hidden) Library.
iMessages are also contained within the chat.db within the Messages Folder.
This, the chat.db, can be opened with TextEdit although it is not that readable (you can make out the messages along with individual Message ID numbers and things to colour the balloons and indicate font type used)
You may be able to extract the Messages you want to "Save" in TextEdit.
Using Quick Look, it says, at the top, that the file can be opened with Messages but my Messages says it can't open chat.db
Today I used the Recents list again and today it is identifying iMessages to and from my son as a conversation with him where as when I posted yesterday it did not.
I did the following.
Opened an iMessage Chat to my Phone.
I sent a single word which caused the previous messages to show up.
I then closed the window (to Save the chats).
I reopened the chat and sent another word to my phone.
I then used the Delete Conversation keystrokes
The Chat window cleared both the "History" and the Current conversation.
I then change the Archive folder and had the last two iMessages sent to my phone as one Chat. (Although it does list both sending times)
It appears the chat.db does not have the info (It id deleted)
It would appear that if you closed the session the Messages may have been saved at that point (or that session part of the Conversation if it lasted days or more)
This may mean opening several Saved Chats to piece together most of the conversation.
It may be that the last few iMessages will be missing.
It seems that Spotlight will find these items in the Home Folder/Library/Messages (Previous OS versions have not allowed a Home Folder/Library SpotLight Search)
At present I have not found away to Stitch several Chats together.
8:36 PM Saturday; August 4, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
iMac 2.5Ghz 5i 2011 (Lion 10.7.2)
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Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images." No, Seriously