He's definitely not an argentine. I agree that he looks like a typical Colombian.. They come in all colors and patterns. You can pick up a small snake hook to make it easier to handle him. Hook train him. Then get a larger hook once he's larger. I have a Retic that can only be removed from her enclosure with a hook but once she's out she's ok.

The female does look like a BCC. There is no way to know the specific locale though. She does need to be seen by a vet to have the lump checked out. They will probably either use a needle to try to get something out of it for testing or possibly lance it.

How long have you had her? Do you know how old she is? You say she's an adult but she will get much bigger than that. In my opinion she is rather small. While BCC should maintain a muscular and rectangular shape, she looks thin to me. I imagine the people who raised her may not have fed her very often at all. An every 2 week feeding schedule for adults is recommended (weekly for youngsters) but I bet she got less than that. I have a 3 year old female BCC that I raised this way and she is quite a bit larger and beefier than your female.

I guarantee if you take proper care of her she will more than double in size. Maybe not length, but she will get quite a bit thicker and being BCC, she could reach 8ft easily.

She appears to be having some shedding issues also. I've never seen a boa shed in pieces like that. Cover that screen and increase the humidity in her tank. Maybe changing the bedding would help also.

Definitely keep us updated on her.