OSB sheets of wood (Southdown AL5)

Require 2 or 3 OSB (Oriented Strand Board) sheets of wood, ideally 8 ft x 4 foot. These are the sheets of wood that builders use for site perimeter hoarding, general temporary opening covers or to stand materials on. If anyone has recent building work done and have any left behind. or resting against a skip for disposal, please let me know. Harpenden area ideally. Many thanks, kind regards