(This is my first SCP idea, so feel free to criticize it.)
A missing poster that sucks in any human who touches it, removes the previous trapped soul appearing in the photographic section of the poster with a photo of the new person. (Poster was orginally for a 8 year old child who was reported missing on April 7th, 1984)
The date will not change when a new person is added to the poster, as such, all memories and evidence of existence (excluding ones prior to April 7th, 1984) of said new person will be removed from anyone (People will remember them as having gone missing on said date) or anything (Police records will be changed to fit the new person).
Any photos that have the new person in them that were taken after April 7th, 1984, will have the new person erased from the photo.