[Geoff Shannon]

collector - a person who collects things of a specified type, professionally or as a hobby.
collect - bring or gather together (a number of things).
bring - take or go with (someone or something) to a place.
gather - come together; assemble or accumulate.

No mention that the number of items that are accumulated, brought together, gathered or collected are not to be used.

I am a collector of slot cars, some I have used, some other people have used and some in an unused state, but all part of a collection.

   

Stabo Trucks.