I believe most bamboo shark eggs are collected from the wild while they're in season. The only company I know that breeds sharks regularly is ORA, and they seem to stick to the carpet sharks like epaulettes. Not saying no one does breed them, just don't know of anyone who does regularly. Not that it makes a huge difference when it comes to raising them, as hatching them in captivity from wild collection is almost identical to getting one that was laid in captivity.
When they arrive, if they're small, dark, and more elongate, they're more likely to be coral catsharks (Atelomycterus marmoratus). Bamboo shark eggs are larger, more oval in shape, lighter in color, and easier to see through than the catsharks. That being said I'm pretty sure LA only sells bamboo shark eggs.