B1/B2 renewal application- lost previous passport with expired US visa stamp

[renewalseeker]

My mom has a B1/B2 renewal drop box appointment coming up and she misplaced her old expired passport that has the expired US visa stamp. what can be done in this case?
She has a total of 3 passports- 1st passport with 1st time US visa is available, 2nd passport with 2nd visa is missing, 3rd/current passport (no US visa). Is there a way we can submit a copy of the missing passport/visa stamp? any other documentation needed?
Appreciate any guidance here.

thanks