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Mr. Levine has this link on his webpage ( http://knife-expert.com/links.htm ) to a Knife World Article by Dennis Ellingsen about the dangers of celluloid:
http://www.oregonknifeclub.org/celluloid_02.html
He has also a link to a picture of a knife with deteriorated celluloid handle scales:
http://www.knife-expert.com/kabarcelluloid.jpg
It is a gamble to own celluloid knives for sure, Duncan.
Wrapping them in plastic will ensure you see the deterioration quickly, if you keep checking them, but will keep the aggressive chemicals close to the knives, ensuring corrosion.
If you wish to preserve them for say, rehandling if needed, then well ventilated storage is better, IMO.