Fake bronze coins buried for years are harder to confirm if authentic or otherwise.
Would I buy?
Yes,
provided the price is low enough.
Decades ago, I was buying bulk Chinese cast cash coins for 20 cents each. Covered all Dynasties and most Emperors over the last 2,000 years. I wasn't prepared to pay more, because I couldn't authenticate them for myself.
As it turns out, they are all genuine, and now all fully identified, but I had no idea at the time of purchase.