This is how I muffle this noisy B#%#%

48 quart cooler from walmart
6" hole saw both sides

eggshell/aurelex on the base of the container

6" insulated ducting
duct tape

back the unit exhaust close to the exit hole and duct tape the duct to the fan creating a seal

front fan will have a cavity

fold aurelex/eggshell around the unit, use a razor to create a slit for the wires

PUT THE PSU IN THE COOLER
fan side toward the cool side
hot side toward exhaust BEHIND the aurelex around M3
put a small amount of aurelex between the PSU and the container edge(otherwise it will vibrate)

use two more pieces of eggshell/aurelex for the top of the cooler, make sure there is a cavity for PSU exhaust to go to cool side(it will exhaust hot air, but a miniscule amount)

insulated ducting on cool side with a filter on the edge(it will get dirty af)

I'll take some pics in a bit, once i make an exhaust box and send the heat outside I imagine sound will be completely silent