Wikipedia - Naphthalene has been used as a household fumigant. It was once the primary ingredient in mothballs, though its use has been largely been replaced in favor of alternatives such as 1,4-dichlorobenzene. In a sealed container containing naphthalene pellets, naphthalene vapors build up to levels toxic to both the adult and larval forms of many moths that attack textiles. Other fumigant uses of naphthalene include use in soil as a fumigant pesticide, in attic spaces to repel animals and insects, and in museum storage-drawers and cupboards to protect the contents from attack by pests.
QUOTE, ref Carpet beetles : 'The larvae are just tiny when they hatch – less than a millimetre in length – which allows them to winkle their way through the smallest of cracks in any museum case. Feeding voraciously on any animal product in sight – they particularly enjoy stuffed animals, fur and feathers, and woollen textiles – the larvae swell up into “woolly bears” somewhat bigger than their ultimate adult forms. The varied carpet beetle larvae is dark brown at either end, lemon yellow in the middle, and hairy all over, while the two spot carpet beetle is torpedo-shaped with tufts of bristles at its posterior end." (From: www.ravishingbeasts.com)