The Mystery Parcel

When I order stuff from Amazon, I generally have it shipped to my office.  This bypasses the annoying back and forth with UPS over whether they can get into my building and safely leave items in front of my door.

A couple weeks ago, I ordered some gifts from Amazon.  There was a book for one friend, and a "Lost" calendar for another.

And the day after I placed this order, the intended recipient of the "Lost" calendar reminded me of our "no gifts" agreement.  Uh-oh.

A couple days later, I received a couple parcels at work.  One was vaguely book-shaped, and, upon further investigation, it revealed the book I'd purchased.  The other was flat and calendar-shaped.  I figure it must be the "Lost" calendar.  Since I'm in no hurry to wrap this gift and hand it out, I take it home in its nice cardboard packaging, and store it in my closet with all other presents.

Today, I came back into the office after the holidays and found an amazon flat parcel on my desk.  I wasn't expecting anything else from Amazon, so opened it, confused.  The contents:  the "Lost" calendar.  It even had the invoice in it, so I knew that this was, in fact, the "Lost" calendar I'd ordered a couple weeks ago, and not some other "Lost" calendar that coincidentally showed up on my desk.

Which leads to the question:  What strange flat, vaguely calendar-shaped item has been spending the last ten days in my closet?