First option is to try to contact the IRS and inquire as to the best way to handle.
If you are unable to get through or get a good answer, then I recommend you indicate on your return that you did receive the stimulus payment (full amounts received) and then contact the IRS to work a replacement for the old check. This way your return will process as normal.
If not, your return is going to be delayed while everything is worked out since the IRS records will indicate you have the payments.
NOTE: Deceased taxpayers who passed after 1 January 2020 are eligible for the stimulus payments. Here is a link with more information.
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