Rule of thumb..always wipe the threaded area before installing the filter on both the filter and the mounting stud.
Otherwise don't worry about it. What else can you do? Trade the car in?
In an extreme failure of the engine, and you think it may be from metal shavings from the filter threads, have the repair garage save anything they find inside then engine. You could send it back to the filter company to be tested. As they know the metal compounds they use for all component parts. Should your engine fail because of shavings off your Wix filter, Wix should warranty the problem.
If your engine lasts another 3-4-5 years..
Chances are when you screwed the filter onto the stud, this could have compressed the shavings you think were there and kept them from being released downstream.
Filter companies will have their backplate assemblies go through a parts washer and anti-rust application machine. Even though the parts are cleaned and "dried", some of the fluid can remain internally in the depth of the threads. When they sit around before being taken to production the backplate can attract dirt and this get's inside the groove. Sometimes people look at the threads and think it is metal shavings in between the grooves. Usually it is other contaminant. A magnet would tell the truth.
There are two methods of making threads, Cutting them. Which can have a tendency to allow for some shavings to remain. Or Rolling the threads which keeps all the metal in the backplate and significantly reduces the chance of metal shavings ( and the method Champ uses to make threads in their backplate assemblies).
If there were shavings and in the process of screwing the filter onto the stud "cuts" them off, they would go downstream and eventually end up in the oil pan. If they become more microscopic and the oil could hold them in suspension, then the filter would stop the contaminant from going any further. So basically you'd most likely have a one pass situation through the engine.
Have you sold the car yet...