iOS - Recent emojis path in a backup

where is the pAth in an itunes backup that holds the recent emojis? They can be useful in parental forensics because these emojis: 👄💋👙🍑🍆… mean the teen is sexting and can identify it easily. World War 3 could hit soon and this means digital forensics will rise due to screening if it is a terrost/war fighter or a civilian and to find microscopic details like this is cool.