2001 gt Keyless Entry Confirmation

Just purchased this Gt and trying to see if I can obtain a toyota keyless entry system. It has the RS security sticker on the side of the drivers window and i confirmed with the Dealer that the VIN indicates the build sheet that a security system was factory installed but its Not apparent that a keyless system was installed at that time. Seems like Toyota could have added the keyless at the Port of arrival or at the Dealer. How can i check to see if a transmitter could have been installed by Toyota? A pic would be good if you have one. I have read several posts its a "box under the drivers side dash" which i need to confirm what specifically im looking for without a shadow of doubt. Thanks for your help.