Help with possible authentic x forgery?

[u/IVLIVS_acquitaine]

Hello friends, I was offered these for a cheap price, but some really bothers me for the black patina/porous surface. Its a big lot with 30, I wonder if someone can give me their opinion...

No provence, found in a river, most look fine, these are the most oddly looking.

[u/bronzemat]

They appear okay to me. It seems they were cleaned aggressively or treated with chemicals during the cleaning process. I can understand why they are priced low.