SCP Foundation

Abduction delusion: Strange lights in the sky that appear at night in a certain place. Then the light touches a person, the person falls unconscious. Hours later, the person wakes up and claims to have memories pertaining to an alien abduction, despite not actually going anywhere. Foundation later intercepts a broadcast from unknown source. The transmission is is an unknown language, but the word "preparedness" is translated.

Death?: Original description: Artifact that causes person to die painfully. Revision: Artifact that causes people to think that the subject has painfully. The subject may no longer interact with people who think the subject is dead, or the things they interact with. As news of their "death" spreads, the subject slowly becomes incorporeal, before fading away

Helper bots: Collective of robospiders that steal pieces of technology. Uses technology to repair ship for an extraterrestrial trying to escape Earth. The extraterrestrial is already dead. Foundation finds message that shows the extraterrestrial was a scout, and attempted to leave Earth after finding Site-██, but was killed by SCP-████. The alien recommended Earth for destruction, because of anomalies present. It is unknown if the transmission was sent.

Abduction delusion

The hook you seem to be going for here is the "unknown, but with lots of juicy details". There's no real way to judge this unless you write it up; it's going to be entirely dependent on how well you can execute the idea.

Death?

We already have several SCPs that deal with the concept of existential crisis, most notably SCP-431, SCP-451, and SCP-1504. I'm fairly sure there's at least two more as well, so what sets yours apart from the existing ones?

Helper bots

This is a bit over-the-top for me. The Foundation, to me, is speculative fiction, not soft sci fi.