Log into your online irs account at irs.gov/account and click the tax records tab. Under 'Get transcript online' click 'GET TRANSCRIPT'. Select 'other' as the reason for requesting a transcript and leave the control number blank. Under 'Account Transcript' select 2021. You'll see your $1400 payment listed with the deposit date. The eip3 will show twice on the transcript, once as $1400 and again as -$1400 (which is not indicating the payment was reversed, it's indicating it was received by the bank). Check your bank accounts on those date, both checking and savings.
