Apparently they stuck in the glove compartment ‘a copy of Douglas Adams' book "The Hitchhiker's Guide to the Galaxy," along with a towel’.
Source: http://m.dw.com/en/what-you-need-to-know-about-the-falcon-he...
Source: http://m.dw.com/en/what-you-need-to-know-about-the-falcon-he...