I’m surprised those files we not the first prints off the new install as they are S.O.P. when setting up Onyx. Anyway, it would behove you to see the results as to where your printing process stands as of now, being new and all. The prints should appear rather perfect and should be kept for reference for as long as you own the machine or until you produce even more perfect prints of the same files and use those as gospel.
Going forward and printing the files routinely, if you see any deviation it will be an indication that something in the process has changed and should be fixed. With this machine, your fix will most likely fall upon something to do with workflow or the mechanical advance on the machine being the reason color or resolution has changed. The mechanical advance of the machine is stable but one needs to sure they are actually using settings they believe them to be. Fortunately, workflow mistakes are often found to be at fault and, once ferreted, they are quick to fix.