mmm don't think I would use our meter cupboard Matty, but then ours is a little bit dark with no natural light and airless and a bit small, so even with a light rigged up I think it would disturb them more than if they were in a quite corner of a bedroom or dining room for example.
Do you live (if you dont mind me asking
) in a very chaotic house with lots of noise? or just a normal family house with people coming and going. We have two parents, and two kids (who can make a normal amount of 'teenage' noise) and we found that a bedroom that is not used for most of the day was fine. If you are worried that you wouldnt sleep at night, you could always consider moving the cage into the hallway when you go to bed?
Just a suggestion. I dont think it does too much harm to hear 'some' normal noises such as steps outside the room, normal voice talking etc., the babies dont want to be brought up in total silence and darkness, just not loud, or sudden noises.
Can't wait til you find your memory stick!