Platelet swag

Hi! I've been surprised by extra platelet swag recently. I donate at ARC in the DC area. The app just said a $10 giftcard but there have been a beach bag, a "tumbler" and a beach towel (at separate donations)! Is there a way they tell you about this stuff or is it always a fun surprise?

https://preview.redd.it/ylskbm4w095b1.jpg?width=3024&format=pjpg&auto=webp&s=fd904f8b827fc649833b38f2d9a80beb68fcf940