Either the car's Title (if purchased out right after August 16th, 2022), this is implied it the material sent to you by stating "..for purchasing a new electric..." OR retail installment sales contract would work.
In the Plug-In Electric Drive Vehicle Credit (IRC 30D) the first sentence backs up the car's title and then under titles Transition Rule for Vehicles purchased before August 16, 2022, Vehicles Purchased and Delivered between August 16, 2022 and December 31, 2022 and What Is a Written Binding Contract? it discusses the written contract which implies the retail installment sales contract.
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