I feel I was wrongfully terminated from my job need to ask if I have a case

I go in at 4am I was in parking lot not on the clock when I noticed a truck turn lights off and go around building when I got there 2 guys was loading up products in back of their truck I called 911 and she asked me could I describe them and what kind of vehicle they were driving when the guys saw me they took off the 911 asked me could I get license plate so I follow to get it and it was covered up and that was it, the next thing I know I was terminated for violating company policy for doing that, I have never been wrote or in trouble in 9 yrs I've been there only recommdations, I was not a salary manager, do I have a case?