E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
To filch, as, I boned it. Shakespeare (2 Henry VI., act i. 3) says. By these ten bones, my lord meaning his ten fingers; and (Hamlet, iii. 2) calls the fingers pickers and stealers. Putting the two together there can be no doubt that to bone
means to finger, that is, to pick and steal.