jscott,
I doubt a dealer would work with you since you didn't purchase the system through the correct channels and don't know who is in control of the licensing for it; if it even has any on it.
Also, it may or may not have the licensing you require for the devices and trunking you are wanting to put on it as it is not a "Free PBX" that is open for use with unlimited licensing.
Also, do you know what the username and password is to get into the system; was that provided to you by the seller?
I think you have purchased something that you will not be able to utilize the way you want to.
Sorry,
TE