This cache has no room for trade items and please bring your own pen. Tweezers might also be necessary.
Stealth may be required because you may encounter some muggles.
One of the muggles you see might be me because I work at the nearby Post Office. I have been working at that same office for over 34 years now but never thought to put a cache here until now.
Most of my co-workers know about the cache so don't be worried about being muggled by any of them. Some of them might actually help you out if you start your question with the title of this cache.
Good luck!