Star Trek Enterprise Model

I have a question about collecting things?

I am a huge trekkie,I love Star Trek,but have always been too poor to have anything worthwhile. Until now.
I was out with my wife lookin at yard sales ( I normaly hate this) and I saw on a table in mint condtion an unopen (obviously not put together) model of the original Enterprise from the 60′s. Plus unopend Capt Kirk,Spock and Mcoy action figures all for 5 bucks.( I had never been so gleeful)<< Anyway my question is this,my brother says the modle will be worth more opened and put together because then people can see it.
I dont plan on ever selling them but what is better for collecting?

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