Export imported POP3 emails to support tickets

[WebPlus]

Hi,

I'm kinda pissed, I followed instructions to setup G Suite email accounts and POP3 emails.

Prior to enable it on WHMCS dashboard, I made sure on Gmail inbox settings :
To enable pop for emails arriving after the time I enabled it (screenshot).
I also made sure to select option "Keep recipient Mail's copy in the Inbox"

Guess what ? WHMCS has pulled each and every email from Gmail inbox and sent hundreds of emails to my customers regarding a ticket being opened...
After digging on the web to find out what I could possibly have done wrong, I found out it is a normal WHMCS behavior ! Seriously ?

This should be DOCUMENTED or at least have a WARNING on setup page : "WARNING: This will delete all source emails from its inbox..."

Anyways, now that it has messed up everything and made us look unprofessional to our customers, I'd like to know if there is a way to export / revert that ?
I need to get these emails back to my inbox for legal purpose more over, I need to answer to some emails as the conversation is not yet closed.

Regards