Shoot it at half of the box speed, bracket toward over exposure and cross your fingers. With this film at that age the rebate will be dark, and the film will probably have lost some speed. Even in a freezer faster films will start to expose over time due to ambient radiation. Fresh, I wouldn't rate this film over 800 and would normally use it at ~400 -500.
Are they 120 rolls by some chance?
If you don't use the film I am very interested in it. The film originally was not well regarded, but I've used it with great success rated at 100 and pull processed 2 stops. Grain becomes big and the contrast goes way down.