My personal view on this is: NO. I do not reuse spokes - even for my own wheels. Within reason though. If it's not seen much riding and I built it - then I will. But I much prefer to go with new spokes.

Hubs? YES. In fact I have a nice set of Campagnolo Record hubs from 1982. Seen many years of use. I cleaned 'em up - and polished 'em with Simichrome. Beautiful! The races were like new, and I did overhaul them frequently.

Rims? Not likely. Unless they don't have any mileage to speak of. Mostly my oldies get hung on walls with stories affixed regarding their age and what action they've had in their lives. That's me in my Museum-Mode. I keep things around as teaching-aids.