Need Info on an antique Osterr.Cassen-Fabrik Wein. Tresor Safe

I have recently aquired an antique Austrian Tresor safe, the only markings on it are on the crown of the crown molding trim that reads, OESTERR.CASSEN-FABRIK WEIN. The original location of this safe was a little shop on the California coast, the previous owner used this safe daily, but recently felt the need to replace it due to the loss of the second set of keys to this safe. He said he tried about 30 different locksmiths and could not find anyone who could make keys for it. He said he had no use for a safe that had only one set of keys. I would like any information on this safe. My wife would like to paint it, but I don't want to if this will change the value of this 1850-1890 tresor safe. I do not want to sell it but I would like to no its value and if it is possible to have another set of keys made. The main key is a flat 3/8" thick by 5/8" width with a notch and a hollow end, the key folds in half like a pocket knife. The other keys are antique hollow end keys with a number on them (2662). There are three different keys for this safe. I do not have my own photos of this safe at the moment but I found a similar tresor safe that can be viewed at the image URL, at the image URL there is a Grunderzeit tresor 1895 that is very similar to my safe, and there is a Tresor Bechor, that is a little bit bigger than mine but it has pictures of the keys Thanks in advance to anyone who can help John A.