Yes. That is where everything is “stored,” so to speak. Anything that is swallowed stays in the gizzard until it is ground down to a size small enough to pass. On a couple of mine I have found rather large pieces of glass and they were worn down extremely smooth, but still too big to pass.Where would the items be? In the gizzards?
We purchased our farm 12 years ago and I am constantly finding all sorts of “hardware.” There is one place in the pasture that I have to run the magnet over very often, especially after a hard rain. The erosion always unearths rusty nails galore, which is detrimental for our horses.