Item #: SCP-XXXX
Object Class: Safe
Special Containment Procedures: SCP-XXXX is to be kept in a sealed room, measuring 3m by 3m in Research Sector-██ with a door 2.3m high and 1.5m wide. Only Level-3 personnel or above is authorized to conduct testing on SCP-XXXX. All personnel who are to enter the room without meeting that requirement are to be severely reprimended.
All research regarding SCP-XXXX is to only be carried out when there are no personnel except Class Ds in a 2km radius from SCP-XXXX in order to prevent casualties regarding important personnel from taking place. The experiments must be observed by Level-3 personnel in a small building located 3km away from SCP-XXXX with live video and audio feed of its containment cell. (Refer to Experiment-XXXX-5)
All instances of SCP-XXXX (SCP-XXXX-1 to SCP-XXXX-6) are to be kept in the file storage of Research Sector-██ and can only be accessed by level-2 personnel and above.
Description: SCP-XXXX consists of a modern Metro style, front opening mailbox. It is made out of stainless steel coated with white paint, except on the opening, which is painted orange. Its dimensions measure 39cm by 19cm by 25 cm, with a volume of 18,525 cm3, elevated 1.2m from the ground on a white post. SCP-XXXX has a small slot, 2.5 cm high, that serves as an entrance for ordinary post.
SCP-XXXX's anomalous property consists of it generating an instant replay to any mail put inside of it. The instances do not have any apparent connection to the contents of the letters sent and they will vary from person to person. The mailbox will only be able to generate this effect on a bi-weekly basis and any letters put inside the mailbox will remain there until two weeks have passed since the last instance was generated. SCP-XXXX will only create one reply for all letters placed simultaneously. Once a person recieves the reply from their letter, any further letters input into SCP-XXXX by the same individual will not generate an instance of SCP-XXXX.
The address in every instance is always the same and extensive examination has proved that it doesn't exist. The instances aren't always generated as letters, since a parcel has already been recieved (see Experiment-XXXX-5). When a parcel is recieved, it will most likely contain the compacted remains of a human being within a 13cm by 6.33cm by 8.33cm cardboard box with no apparent opening. The human being present in the parcel will have disappeared shortly before reapearing inside it. This effect seems to randomly select a person within a 1km radius, although researchers do not know if the radius can increase in size.
Addendum: The following logs contain the compilation of the most relevant details of the research done to SCP-XXXX:
Input: Dr. ███████ placed a postcard with an image of the Empire State Building. Nothing written on it.
Reply: SCP-XXXX-1 is an envelope with a letter that only has three sentences: "How could he do it like that? He left a mess all over the room and didn't even bother cleaning it. Sooner or later they will find out."
Notes: The letter is very dirty and analysis of the brown substance covering it shows that it is a mixture of dirt and blood.
Input: Dr. █████ placed the same input as in Experiment-XXXX-1.
Reply: SCP-XXXX-2 is an envelope with a small piece of ripped paper. It has the numbers [REDACTED] and below them: "I hope this will make your life better!"
Notes: At the end of ██/██/████, Dr. █████ discovered the same numbers in the local newspaper. They were the winning combination for that week's lottery. "Damn" was the word repeatedly said by Dr. █████ after his discovery.
Input: Dr. ██████ placed a letter which only read: "Jackpot"
Reply: SCP-XXXX-3 is an envelope containing a piece of paper with printed writing. The font used in the letter is unknown to all softwares but it is legible: