If I understand it right, you have the actual PCB board, but not the design files?
1 - Is this board a 1-2 layer board?
2 - Was the board not populated before?
If the answer to both questions is yes, then you can send it to some companies who are specialized in "copying" the board, the to a scan out of the board, make a gerber file out of it and send you the data, then you can use the gerber file and send it to any board house you choose.
If your board has more than 2 layers and was populated before (or it is populated) the it is another story, there are companies who can do this, but it will cost yu A LOT of money.
Let me know if you want to find the name of these companies, I think I can find reference to a couple of them if I look for it.
BR,
/Farhad