Should I open it ?

[mojjax]

It's a little package of G. W. stamps - 200 count - could be used , unused , or both , or all gummed together ?

 

[BigWaveDave]

Yes, open it.
If unused, how fun it would be to use as valid postage.

 

[A2coins]

Yes crack em open

 

[Willy Garrison]

I could have left it in the package. It is believed that a large collection value is intact (not opened, not used) things.