My family and I have been quoting this movie going past two decades, and I have two--TWO!--copies of it on DVD. One has been opened. The other is in wrapping, but not in a box. Is it worth less or more?

And where do we stand on sleeves? Do they count as boxes? Does a sleeve and it's, uh, topless (five-sided) box (bin???) that is slides over to 'complete' count as one entire box? Or is it 1.3 boxes?