Hi @JBustamante and thanks for the tag @BérangèreL ,
If you migrated your email accounts using SMTP, it is possible that the date and time could be overwritten with the date and the time of the migraiton. If so, you would see the date and time of the migraiton in HubSpot.
The preferred method for the migraiton to Google Workspace Enterprise would be to use the Google API or the Google Workspace Migraiton tool. When you do this, you can set the preferred timestamp for retention of your emails.