Whether you accidentally deleted the emails or they disappeared for some unknown reason, follow these instructions to get back your missing Google emails.
How to Recover Lost Emails or Missing Emails in Gmail 2023
There are a few reasons why Gmail messages can get lost. The most common reason is that you accidentally move or delete them, but forwarding and filters can also cause emails to disappear.
There are a few ways to find missing emails. They could be in spam, archived, deleted, or something else.
Check your spam folder. It's possible that the missing email was caught by Gmail's spam filter. Select Spam from the left menu. (You may need to scroll down and select More to see it.) If the missing email is in your Spam folder, select the checkbox next to it, then select Not spam.