I’m everything you can’t put in a box. I’m nothing... and that’s my job. What am I?

I am the integral part of unlocking secrets. I'm the first half of how you type on a computer. Sometimes I'm chained so you don't lose me.

Being scammed out of all your money by wooly clothing

Both inside and out, you can never escape. I make up your bones, your eyes, and your face. When it gets cold, a phoney arrives. Use it gently when things go awry.

A detective may wear me when solving a case, I perch atop of a cat making a mess of Seuss' place, A gentleman tips me when greeting a lady, I'm one of the first things they put on a baby