SCP-XXXX is to be contained in a locked bulletproof box and watched at all times through a security camera, armed guards are also to be assigned outside of the containment chamber and they are to be on a 5-hour rotation.
Run on sentence.
SCP-XXXX is a single piece of A5 paper, when viewing the paper directly it appears to have letters in the language the viewer's first language but when viewed through a camera or a picture of the item is viewed it appears to be blank.
Also your paragraph spacing is wrong.
Also also paragraphs should be longer than one sentence
Also also also this is shorter than my thumb.
When a subject reads the text on the paper it gains the ability to recover from any damage done to its body the subject doesn't seem to age either.
Uh okay this seems like a pretty random effect.
When a subject reads the paper their reaction is that they remember reading something but they don't remember what they read the only known exception is when a subject can't read then it isn't effected in any way.
Run on sentence, that should be "Affected".
24-72 hours after the subjects' read the paper their only desire is to do is destroy themselves.
Nope nope nope don't do that nope stop.
SCP-XXXX was recovered in [DATA EXPUNGED] in 1986 when reports of police officers repeatedly shooting themselves and were fine a few hours later came to the foundations attention.
Foundation is capitalized, poor tone, run on sentence.
The officers were all taken to site-██ and frozen to contain them
Also site should be capitalized.
the locals were given class A amnesiacs all evidence of the incidence was removed from the media.
Should be a comma in there, that should be "incident".
The paper was replaced with a replica with a text commonly found on suicide notes.
BECAUSE SUICIDE NOTES ARE ALL THE SAME LOLOLOL
The addenda are unnecessary and could easily be folded into the containment procedures.
All in all this is a terrible idea with no substance, and your writing is lacking, to say the least. Articles should make me feel something, this one doesn't. Articles should have more depth to them than this one has. This is barely an article, this is the summary I would use describing an article to someone.