Comb being drawn is a good sign. The only way to tell if the queen is there is to actually see her or see eggs, in which case she has been there within the past 3 days. Sometimes if a hives is queenless they become a bit aggressive. Sometimes when a hive goes queenless one or more workers will start laying ~ you will be able to tell this as they only produce drones and tend to lay a more irregular pattern than a queen. The bees do not leave when the hive is queenless, however as there are no new replacement bees being born, the hive will die off as the worker bees die ~ usually within a month. The bees may just continue to work as usual even without a queen.
Pollen coming in is a good sign as they need it to feed the larva. It is amazing the colors of pollen they find ~ yellow, orange, red, white, blue and green. There is a color chart with pollen sources here ~ http://en.wikipedia.org/wiki/Pollen_source
I would give them a few more days to draw out comb and then check for eggs. I usually start checking for eggs about a week after installing a package. They will most likely be in one of the center frames. I also have been marking my queens when I find them to make it much easier to spot them. I learned how by practicing on drones first.
That was awesome to see.
