Would it be better to sell the December 2009 Collection unopened or separate? I'm not sure if this is the right place, though ;>>

Unopened. you only get to pick ONE item from a collection. And nobody would pay more than the price of an unopened collection for any one item inside it.

Oh, okay |D I didn't know that. Thanks |3

Moving this to help & questions. :)

Whatever you want, really. I've had people buy separates for me that are worth more than the actual Collection.

The box itself usually goes for higher, depending on the box and the items within it.