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If they looked it up by VIN and it indicates it has it, then it was made with it. Otherwise, it would not indicate it using the VIN.
Since I am not there, this is a tough one, but here is what I have: First, a schematic of the key-less entry system. The second picture is of the power mirror connector and the wireless door lock ECU.
The next three pictures are for trouble shooting the system. Perhaps there may be something there that helps.
Picture 6 is for the location of the wireless door lock ECU.
Picture 7 is for all Toyota vehicle's ECM location. Interestingly, at the bottom of the picture it says 1997 and 1998 model years are under the seat, but the picture is for 1998 and 1999 models are on the left side, behind the dash. It is possible your vehicle was made late in the year and there was a redesign it received that most 1997's did not.
Let me know if this helps or if you have other questions.
Images (Click to enlarge)
Friday, July 27th, 2018 AT 9:20 PM