No, you have to report the payments the IRS thinks they sent you. If not, your refund will be delayed while the IRS corrects your return and reduces your refund.
You have to start a Trace on any missing payments. See the instructions here,
https://www.taxpayeradvocate.irs.gov/news/tas-tax-tip-did-you-have-an-advance-payment-of-the-child-t...
Note that those instructions say to write "AdvCTCPMT" to trace a missing advance child tax credit payment. If you are missing the third stimulus check, you would write "EIP 3" on top of the form instead.
