For what it is, the price of that box is criminal. Nothing a reasonable heavy duty plastic bag won't do. It's not like it's a moving part subject to a lot of access. But, hey, it looks cool.
I opted for this...
https://www.amazon.com/Custom-fit-Protector-Porsche-Boxster-986-1997/dp/B017JIQD2O
... and carry it with me if I'm heading to the hills or if there's a remote chance of rain. Also, it keeps the interior fairly cool upon returning to the car on a hot day.