Green’s Dictionary of Slang

(UK Und.) goods that are pilfered from stalls or shop windows.

1591		Greene Second Part of Conny-Catching in Grosart (1881–3) X 122: Which stolne parcells, they in their Art call snappinges.
1608		Dekker Belman of London G: He that hookes is called the Curber [...] The goodes are called Snappings.