This cache is the perfect candidate for a cache and dash, whilst avoiding suspicion! Located at a Post Box, most muggles won't question you standing by it - just pretend you're reading it 
Please park responsibly around this area, and be considerate of the residents who live nearby.
I have put a good amount of effort into ensuring this cache is a fun one for both kids and adults alike to swap little nick nacks, and therefore I politely ask that people swap out items for things of similar value.
Happy hunting!