we've had good luck with direct releasing the queen when we were not going to be able to come back and check on them. i don't know if i'd feel so confident if the package had been made up the day before installation, but if you know the bees have been with the queen for a few days i wouldn't be too concerned.
some of the commercial guys dunk the queen cage in warm water before opening the cage (when wet, she can't fly away, and it probably does some scent masking).
if it is a 3 hole wooden cage, just pry off a couple of staples.
i've only had one package ever try to abscond...fortunately in this case the queen was still in the cage, and i poked at the swarm until they returned, then added a frame of brood. installing so many packages (presumably in many different locations), you might consider putting a queen excluder over the entrance until there is open brood.
deknow