You probably lost it in a car wash. Do you have the roof rack installed? All part numbers should be in the below link depending on which version you have.

https://toyotaparts.bochtoyotasouth...ts/2014/toyota/rav4/le-trim/2-5l-l4-gas-engine/body-cat/exterior-trim-roof-scat

I have the roof rack and the long center molding between the rack arms kept popping out during carwashes. I recently just put a dab of below stuff in the middle of the strip and it held up pretty well the through the last car wash. I'll probably do a little more when it's nicer out.

https://www.amazon.com/3M-08008-Black-Weatherstrip-Adhesive/dp/B00063X38M

Looks like it has happened to others here in the past. 1 turned into an argument about using car washes vs hand washing so not much info in either one.

http://www.rav4world.com/forums/88-4-2-faults-fixes/154754-missing-roof-drip-moulding.html

http://www.rav4world.com/forums/125-4-4-exterior/141529-rain-rail-rubber-insert-coming-loose.html

 

Thanks! I got a replacement for $20 from the dealership and they installed it free of charge when I came in for my tire rotation.