If something cannot be observed, then does it exist? How do you know that it exists if it cannot be observed and you do not have proof that it is what you think it is? This falls along the lines of "if a tree falls in a forest and no body is there, does it make a sound"
The question of whether something can truly exist or not without being observed is an interesting one. Some philosophers have argued that nothing can truly exist unless it has been perceived by someone or something else. According to this view, only things that can be experienced can truly exist.

However, many people believe that existence is more than just experience. They argue that existence also involves reason and logic. If we assume that existence involves these qualities, then it follows that something can exist even if it cannot be directly observed or proven to exist.

In short, while it may be difficult to observe some things, we can still conclude that they exist based on other evidence and logical reasoning. Ultimately, the answer to the question of whether something exists or not depends on our individual beliefs and perspectives.