Many thanks to @keanulatino for tweeting the link!
Stgo2night has posted a gallery of photos from the Knock, Knock wrap party that was held on Friday, May 9. There are three with Keanu and you can view them here.
Also many thanks to celiarebolledop who has shared a photo that she took of Keanu on the last day of filming on May 8. Her comment also says that she met him. Many thanks to @keanulatino for the find.