Keeping the original box thebgun came in adds a bit of provenance to your firearm.
In the late 70's, a gentleman drug a WELL used Win M12 12 gauge into the store. Well used, but not abused and wanted to swap for another shotgun.
The store owner made him a deal on a Rem 1100.
The old man grinned and said, "I didn't expect a deal like that! Let me go get the other barrel!"
He came back in the store with an IC barrel with matching serial numbers....IN THE ORIGINAL WINCHESTER BOX!!!!