I haven't seen this either, and I've burned 10 to 12 tons of them over the past 5 years. I have occasionally seen a matchstick-like sliver or two as I pour a bag, but the stove didn't mind...A friend of mine has been finding large pieces of wood in his Barefoot pellet bags, by large I mean mulch size pieces. I too have had this happen, but near the frequency he has.