Or perhaps you should just leave them alone ....
if it ain't broke and all that ... I take it your question is curiosity and not because of a problem.
alternatively ... if you just can't live with the thought of two file taking up space on your hard drive
(like when a filling falls out)
create a folder called deletemelater
move the two files into it ... carry on regardless for a couple of weeks ... print a few files etc etc .... when you are certain you don't have any new problems ... delete the files.
(and folder - don't want another question about the deletemelater folder in six months ;-)