After you file

My taxes were approved by the IRS and I've checked the website before a few times. It says that My taxes were expected to be in my mailbox by March 6, 2019 lol. It's not a problem with the IRS, I just think my taxes possibly got lost or something else happened. When I called before they said the address was invalid and then I made sure to spell out my address perfectly and they told me 7-10 business days but it's still not here. What should I do?