This is an easy park and grab just to help you out with your numbers or so you have a cache to find on a day that you need one.
The container you seek is just a black 35mm film container hidden under a lamp skirt. You may have to worry about some muggles in this area as it can be very busy at times and other times seem like a ghost town.
Please replace the container back just as you find it and if there are any problems with this hide feel free to send me a message and I will get it taken care of as quickly as I can.