On Messenger, once a chat is deleted (from the device and/or account), there typically isn’t a “restore deleted messages” button—most of the time they’re gone for good unless the messages still exist somewhere else (like a synced backup, or another device/account that still has them).
If you’re trying to monitor what’s happening for real-time safety, tools like mSpy can help by capturing key activity so you’re not depending on “restore” features after the fact.
Quick honest downside: even with monitoring, you may not get perfect visibility of every chat action (especially if the account uses end-to-end encryption or the user clears things fast), so it’s best to pair it with an open conversation.