The easiest way to see which texts a subscriber has received is in the inbox. Just head to your inbox and type the subscriber's name or number in the search bar.
From there, you can see all outgoing and incoming messages for that specific person.
You can also create a Subscriber Texts report if you want export their messages as a CSV file.
Head to Settings > Reports > Subscriber Texts.
Select a date range and the subscriber you want.
Click Create Report.
This report will show the date and time of each incoming and outgoing text to that specific subscriber. It includes any workflow texts, inbox messages, replies, and texts sent from subaccounts.