Green’s Dictionary of Slang

(northern, to steal, to pilfer, thus Irish) truff n., stolen goods.

[1718		A. Ramsay Lucky Spence’s Last Advice [ballad] Cleek a ye can be Hook or Crook, / Ryp ilky Poutch frae Nook to Nook, / Be sure to Truff his Pocket-Book].
1864, 1867, 1870		Hotten Sl. Dict.
1997		Share Slanguage.