Spying is not acceptable in Islam, whether one is spying with one's physical eyes or using non-obvious/non-ordinary means.
Jinn are not God and cannot know everything, although their unique nature allows them easier access to certain types of information about an individual living person. There is nothing in Islam that precludes the possibility of communicating with jinn, but there is no guarantee that information received in this way is reliable. This is one reason the Qur'an emphasizes that it is from God and not inspiration from jinn (majnun).
It is said in hadith (if I recall, from Imam al-Baqir) that there are jinn who serve the Imams and go to the followers of the Imams and report back to the Imams on their wilayah. Perhaps that is the most important type of finding out about people!
[Of course, the Imams do not require that assistance, but it is related, anyway.]
We should not blame Jinn when we lose or misplace our items. Jinns have their own world which is different from ours and we are been taught to recite Quranic verses to avoid any harm from bad Jinns and bad people i.e. Sura Al Falaq and Sura An Naas and Ayatul Kursi.
You should search properly for the lost items and pray to Allah (SWT) to guide you to find what you have lost or misplaced.
Reciting Sura Al-Fatiha and gifting the reward to the mother of Imam Al-Ridha (AS) is useful to find lost or misplaced items.
It is not impossible but it is deeply, deeply unlikely. Unless you have a specific reason to think this is the case, it is better to focus on other explanations since it is easy to get paranoid about jinn doing things. How often do jinn get blamed for the acts of men!
You should look around very carefully since things do sometimes get misplaced and also ask around where you live. Also, do not underestimate the capability of the human being for thievery. Human beings have much more use for your mobile phones and watches than jinn, as, last time I checked, no one has sighted any jinn wearing watches or using mobile phones.
However if you wished to genuinely pursue this, you would have to try to find out what happened and take it from there. Eg if a person who lives with you takes something, you can sometimes get it back by asking. If someone living in another country sneaks in, steals something, and sells it on eBay, it is a different case. This is not any different. How similar are the creations of Allah to one another!
However I still think that human beings are responsible here.
Jinn are creatures like us, created by our Creator, Allah, who created every thing, but their world and situation, is not like us. They are not metaphysic but they are true existence in their own world. Jinn are not Satanic beings because we read in Quran about Jinns saying: There are among us that are righteous, and there are contrary, we are groups of different ways) Sura 72, Verse 11.
Jinns are unseen by us, because of our limitations, but there existing just like us in their own world. We are not responsible to go through details of Jinns world, on the contrary, we should avoid trying to get any help from Jinns because that will cause more hardships. ( Sura 72, Verse 6).
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