Check your archived messages or download your past Facebook data.
Check Your Archived Messages
Anarchived message in Messengeris hidden from your inbox but isn’t permanently deleted.
It’s possible that you selectedArchiveinstead ofDelete.

From the Messenger App
One way to uncover conversations you archived is through the Messenger app.
If the chat was archived, you’ll see it here.
Tap it to fire up the conversation and find your “deleted” messages.

To return a thread to the main Chats list, tap and hold an archived conversation and then chooseUnarchive.
From the Messenger Website
Archived Facebook Messenger conversations are also available from the desktop website.
This works from the mobile app and the Facebook website.

Scroll to the bottom and tapSee more in Accounts Center.
Go toYour information and permissions>Download your information>Download or transfer information.
choose the account that has the messages you want to download, then tapNext.

If there are multiple accounts listed here, such as from Instagram, double-check you’ve selected yourFacebookaccount.
ChooseSpecific types of information.
TapMessages, then chooseNext.

Decide where to preserve your messages, then tapNext.
Pick theDate rangeyou’re interested in and then tapCreate files.
You’ll get a notification when the file is ready; tapDownloadto receive it.

initiate the archive and look through your messages for the conversation you want to recover.
FAQ
No.
You will, however, see a notification when the message is read.
Yes, it’s possible for you to unsend any message no matter when you originally sent it.
Tounsend a Facebook messagefrom the app, tap and hold the message and selectMore>Unsend.