This is the bonus cache available to those who complete the nearby SCG Adventure Lab.
You can open the Adventure Lab using this finely crafted link:
https://adventurelab.page.link/3QWi
Or try this QR code:

The coordinates for this cache will be revealed once the final answer for the Adventure Lab is provided.
This cache is available 24 hours a day, as is the Adventure Lab. But some times will be more muggle prone than others.
For those driving here, I've provided coordinates for free parking.
Of course, there are plenty of public transport options to get here, by bus or light rail. You can even take a 20-30 minute walk from Central Station.
