Can't determine if i have a CFW or not.

Hello there everyone,

I recently bought a modded ps3 and it had multiman installed and the *install packages folder, and that is pretty much it, can anyone help me recognize what is the state of this ps3? is it Jailbroken? is it possible to install CFW Rebug on it? Do i have CFW ?

Thanks in advance.

Slim model, CECH-2503A, DATA CODE: 0D, firmware 4.60.