The snowman Peeps were the first clue. Lea is usually more freshness-sensitive than, say, my mom, from whom I fully expect to receive last year's leftover Halloween chocolate only when she cleans out the candy bowl in preparation for Easter.
Also, the letter mentioned voting. For president.
So I finally checked the postmark on the package that arrived yesterday. It was mailed in November!
While I offer kudos to the world's postal efforts in getting this package halfway around the planet, I do have to wonder if the envelope spent a few months on a desert island or in a time warp.