This sounds really weird, normally you should receive the messages to your primary email address of your Google account. You can always check on myaccount.google.com which email address this is ("Personal information"). Maybe the email is different than the one which you checked?
Also: Did you check Gmail directly (mail.google.com)?
Did you - apart from the Spam folder - also check all other labels or the "advertise"-folder? Or do you have any filters active which are switching emails automatically somewhere? This article could help you find the emails in Gmail.
I would also recommend to check
I received my emails for example to my @Gmail.com-address, so I could find them directly in Gmail in the inbox. And Google send multiples (confirmation, shipping, etc.).
Hope you'll find the emails!