This reminds me of a flight I had in July. I had used my Reserve companion certificate to secure two seats in first class (it was going to expire, so why not?). I sat in 2A, put both blankets and pillows in 2B while I got my stuff settled. About in the middle of boarding, a woman passing through the aisle just grabbed one of my blankets and kept walking back to economy. I was kind of dumbfounded, so I didn't say anything. Since I had two of them, I didn't want to make a fuss. But I wondered if I should have mentioned it to the FA, as those blankets are pretty nice. I hope it didn't end up in the woman's tote bag.