I open the box on one side using a butterknife, to make sure the pressure is evenly spread. Then, carefully slide the acrylic container out. When unscrewing the car, I hold the car upside down, whilst slightly pressing the roof with my index finger. The screws I put back in the holes on the inside, securing them with masking (painter's) tape. The container goes back in the box and the whole is stored in a moist free environment.
When i order diecast cars, i don't throw the boxes away, instead i put them under my diecast car collection cabinet. Also i have unboxing videos on my channel