WTF's a box face eel?

[eatingleg4peanut]

I see 3 posts on CL of someone giving away a boxed face eel for free, searched online cant find anything on it, or what it is.

 

[Madding]

Go to the source.

 

[eatingleg4peanut]

I dont want it, just wanna know if its a real thing. It seems scetch since the only one that has a picture of it, is just a picture of a filter.