Enclosure needed

I want to mount an enclosure on my lawn lamp post that is near the back of my PIP.
In the enclosure with be a duplex outlet box with a switch on the left and an outlet on the right. I'll plug my Kill-A-Watt into the outlet. Then I'll plug an appliance right-angle plug into the Kill-A-Watt and the other end for the EV cable. I want to also put the EV cable box in the enclosure with the cable out the bottom.

So I need a 5" x 5" x 18" to 24" black plastic or baked metal enclosure with cover that I can add a lock. I'd even use a Tupperware tray with cover, if I could find one.

Any Ideas? I've checked HomeDepot, Lowes, Electrical shops and Craft Shops.
I need to find it soon so that it's done before the snow comes.

 

Nope. I want to also put the charger cable black box in it. Needs to be 18 to 24 " long.
Local Contractor Electrical Supply house didn't have what I want.