How to verify SE?

Im not sure about checking to see if you have SE or not, but checking for towing prep package is easy. If you look at the driver side fog light, when looking straight at the vehicle, there should be a hole to the direct left of the light. That hole should lead to a a radiator if you look into it. Also below the front bumper on the driver side below the fog light, you should see some slots in the plastic skidpad that also lead to that same radiator. If you have this you have the tow prep package.

The VIN number on the window sticker should agree with the VIN number on the vehicle. The window sticker will specifically list the model and all included options.

Your HL needs to have at least this equipment package to be an SE model:

17-in. alloy wheels, rear privacy glass, integrated fog lamps, black roof rails, rear glass hatch, moonroof, front/rear automatic climate control, leather-trimmed interior, AM/FM 6-disc in-dash CD changer and multi-function display with backup camera

The above is from the buyatoyota.com site.