Hi Clark,
We were in Indiana last fall and visited the manufacturer of the door locks as I needed a couple of keys. Landmark uses the following:
Fastec Industrial Corp
23348 C.R. 6
Elkhart, IN 46515
1-800-837-2505
website: fastecindustrial.com
If you call ask for Felicity (Flip) Miller, Customer Service Rep, or Ed Halvorson, Product Manager. They were both very helpful and I'll bet if you have the code number off your lock they can send you a couple of keys.
Bill