I don’t use a box, but on 1st December I put Christmas bedding on their beds and they use a Lush Christmas bath bomb at bath time and wear new Christmas pyjamas. I also buy a new Christmas book.
This year, I’m adding the invites to Lapland UK (if it’s still going ahead without masks).
Then on Christmas Eve, we read all of our Christmas books (many bought over the years), use another Christmas bath bomb at bath time, drink hot chocolate with cream and marshmallows. They also wear new pyjamas.
I don’t think of pyjamas and books as just presents though, as they’re used throughout the year.
MIL bought the elf and the book about it flying back to Santa carrying tales of being good or bad. I don’t like the concept. I’m giving the book to the charity shop. I’ll keep the elf stashed away just in case DC ask for it in future after hearing friends do it.