Corrected entry: According to the newspaper Charlie is reading (with current headlines, obviously not an old paper) toward the beginning of the movie, we see that the movie is set in June 2010. It's stated numerous times that Riley has been missing for over a year, yet his poster says he was last seen in May of 2010.
White Lock
13th Jul 2010
Correction: A minor can be missing from their home, but still have been subsequently "seen" at some point after the day they officially went missing, so long as they were not recovered and returned to their home and their current whereabouts remain unknown.
Phixius ★