I would not be concerned about not seeing the queen, even a marked queen can hide easily. what I would have on my mind is the queen cell, It is not uncommon for a hive from a package to attempt to supersede the queen thinking she is failing because she is slow to start up with egg laying, (mostly due to lack of drawn comb) if you have eggs you have had a queen within 3 1/2 days. At this point if your queen is missing they have built an emergency replacement. if she is there and they perceive her as being poor, they will either supersede her or of she picks up tear down the queen cell. In any event it is now in progress, if the queen is missing there will be a decline in work forces while awaiting the new queen to begin producing. It may be wise to monitor the hive add some brood and maybe bees if it gets too low.