Reach out to Toyota customer service: If the local dealer doesn't have the information you're seeking another option is to contact Toyota customer service directly. They may have a record of the original window sticker or be able to provide guidance on how to obtain it.
Search online databases: There are several online databases and resources that may have information about your vehicle, including the original window sticker. Some examples include Edmunds.com, Kelley Blue Book, and Carfax.
Access state vehicle records: In some jurisdictions, state motor vehicle departments maintain records of vehicle information, including original window sticker. You may be able to obtain a copy of the window sticker by visiting your local DMV or submitting a request online.