Is this bird a black marans or just some kind of mutt?

[Chicharron]

I hatched this guy from an ebay egg, the seller claims that they have black copper marans and about 20 other kinds of birds. They all mix together, so he could be anything. If you look closely you can see some copper in his hackle feathers. What do you think?

 

[The Moonshiner]

Sounds like the odds are against it.
If it was a pure BCM I'd expect a lot more copper color