What are Infocom feelies?
Infocom was a very popular developer and publisher that created a lot of text adventures (now call them Interactive Fiction). To make things more spicy, Infocom filled the game boxes with a lot of items and called them "feelies". Some of the feelies were used as a form of copy protection, others were there just to let the player "feel" the game outside the computer.
For example, The Hitchhiker's Guide to the Galaxy box came with a Don't Panic! button, a Pocket Fluff, an empty plastic bag (the Microscopic Space Fleet), a pair of Peril Sensitive Sunglasses, an order for the destruction of Arthur Dent's house and an order for the destruction of Earth, both on paper.