Returns:
`Optional[str]` or `_CACHED_NO_EXIST`:
Will return `None` if the file was not cached. Otherwise:
- The exact path to the cached file if it's found in the cache
- A special value `_CACHED_NO_EXIST` if the file does not exist at the given commit hash and this fact was
cached.

Example:

```python
from huggingface_hub import try_to_load_from_cache, _CACHED_NO_EXIST  
filepath = try_to_load_from_cache()
if isinstance(filepath, str):