shrink sealing is easy, alot of stores keep shrinkl-wrap machines within the stores, you can also get it done for fairly cheap at office supply stores.

I bought a video game many years back and after opening it I realized it was a crap game... so I took it to a local Blockbuster Video and asked my friend their to reshrink it, then I returned it to Wal-mart and got my money back. It wasn't damaged, or missused... I kept everything with it, so I didn't see any reason not to return it, but they have a "opened game" policy that they can't return it.