Where are my email folders stored and in what format?

I am using Mac Mail 12.4 on a 2013 iMac with Mojave.

When I go to the MAIL folder, I cannot see any folders or files for each of the folders I created. I as told that there are EMLX files someplace that store email by folders. I cannot see this anywhere. Does anyone know where are the email folders I created and the emails stored?

I see the following structure in the MAIL folder - when posted, the copied image was taken out...

When looking at the MAIL folder, I see the following folders and files:

- Bundles (nothing in it)

- V2 - MailData-Accounts.plist

- V6 - has 7 entries that are similar to this one: #BFTY….BOB -DeletedMessages.mbox       The other 6 entries have a mixture on inbox, junk, etc. MBOXes..

  - Drafts.mbox

  - Inbox.mbox

  - Junk.mbox

  - SentMessages.mbox

- MailData

- PersistenceInfo.plist

Thanks