You didn't explain how you retrieved the five years of sent mail. Was that in backup you did of the profile prior to the reformat? Did you do a backup? If you did a backup and that is the source of the five years of sent mail and the deleted mail, then more information is needed on how you got where you are. Messages received previously would depend on your account's seup, such as POP or IMAP, and your settings for the account.

Hi David It is IMAP I didn't do a back up as it was my email account that was hacked. All the emails that I referred to appeared when I reinstalled Thunderbird, not immediately but in the space of 30 minutes. I wasn't expecting any emails but just thought that if those appeared was it possible to retrieve any others

Thunderbird automatically repopulates all messages on the server. Check the account online to see what is there. All messages there should appear on Thunderbird. You may need to check account settings, but the default settings are usually okay. If you had a large number of messages there, it may just be a matter of time for the repopulation to happen.

Thanks for that I will give it a day or two and see.