Haven't received tax refund in mail yet

Soo, the IRS supposedly sent out my tax refund in the mail on July 8th, 2019. I moved from the address i put when i filed but i filled out a change of address slip with USPS & i also confirmed my new address when i verified my identity in person at my local IRS office. It's now August 2nd and i still haven't received my check in the mail or heard anything regarding it. Does anyone know what could have happened?