Edit: Unfortunately, it looks like these lovely boxes are no longer available for download. Find a similar popcorn box template here (page 14)!
Here's a perfect match with this week's kettle corn recipe: free printable vintage popcorn boxes! Created by the lovely Natalie Jost for a birthday party, these would be great 'gift boxes' for your freshly-made popcorn. If freshness is a concern, you could put the popcorn in a tied plastic bag before putting it in its own vintage popcorn box.
Alternately, use one for a 'movie night' gift. Throw in a bag of microwave popcorn, some Sour Patch Kids and a gift certificate to Netflix. Some yellow tissue paper and you're done!