@pennsyfan- Great find...I am a collector of the "O-27" type small boxcars. The Wix car, as you say is one of the more rare, and yours looks terrific. Here is most of my collection pictured below: I especially like the ones that Lionel did for special customers so that they might have a unique train set. Such things as "Toy's R Us", Macy's, Tru-Value Hardware, Sears, and others.
I would consider this one of the more rare ones that I have (I don't have a "Wix") its the Chun King , Orient Express. This was the unique part of set X-150 in 1956. After years of looking I finally found this one at a train show in Austin, Tx in August of 2022.
The Wix boxcar carrying number 6014 - 150 was a component of set DX 837 only offered in 1959. Although not really known positively, it is suspected that the Wix car was commissioned by the WIX Corporation of Gastonia, North Carolina. Now to give you something more to look for, the component box with the proper "-150" suffix is considered even more rare than the car!.
Best Wishes
Don
