Why don’t you just find out who the previous owner was and contact them to find out. I have done that numerous times in the past on my previous vehicles and sometimes to my surprise they had extra stuff for the vehicle that they never gave to the dealer. I bought my existing 2017 SCREW used and the previous owner put a little over 20K in aftermarket accessories, I even found out what company installed the accessories and was able to get the Warn winch warranty repaired as a result. Good luck with your new truck!