Hey there E,
okay so login to My verizon,
click on 'my bill' tab,
click on bill details,
select your date range,
and then in the right corner where you should see voice details and message details,
click on message details.
It SHOULD show you the record of txt messages sent from that particular phone line, and what time it was sent from your phone.
it will show what date and time there were texts received, but i'm unsure of whether or not it shows the phone number or address that the text was sent FROM to your phone.
Let me know if this works for you! If not you can always call cust svc, (*611) or the 800 #, and one of the reps will be glad to let you know that information.