[Venger]

Steatoda grossa by the look of it.
If you can get to the box, then you can get to it, surely.
Try a brush and a glass - just knock it into the glass (or jar if paranoid - with lid)
If all else fails use the hoover (1 spider death isn't going to make a difference)
These can give you a nip if provoked (always in self defense)

Just pop it somewhere dark when you move it (shed, coal house, etc.)