The condensation that you see is largely due to your window providing a surface for it to form on.
High humidity in the hive is partly due to evaporation of the water in nectar, but don't forget it is also as a result of the bee's respiration. A quick look at the back of my envelope tells me for every kilo of sugar they consume they produce about 660g of water (and some carbon dioxide). Provided the bees are able to ventilate the hive adequately the box will breathe out water and carbon dioxide and breathe in oxygen. In most hives wood (or insulating plastic) sides contain the humid air without triggering condensation. I don't suppose in your case the condensation will do much harm, except of course that it forms a reservoir of water the bees cant ventilate out. In winter a little bit of condensation can actually provide a convenient water source for them.
Moral of the story? Putting windows in is silly, you can't see anything useful through them. Set up a observation hive if you want easy viewing.
@ChrisM You mean evaporation dries honey don't you.
Assuming you have the queen you can put them back in your apiary. You may get a small, insignificant drift of some of the swarm bees back to old hive. Make sure they have plenty of space in the new hive and reduce the entrance to no more than a hand width. Some people will put a queen excluder on the floor until they are working the combs, but it's not generally advised.