the bees on the outside are probably hot. they hang out on the front porch when the temp is up.
set your box on your bottom board next to the established hive. with your hive tool, or small prying tool, gently lift the end of the 1st frame. watch to see if the comb is stuck to the frame next to it. in unattended hives, sometimes the bees get messy. if the comb is attached, use a sharp and long knife to slice the comb apart. you will spill honey and kill brood, but that can't be avoided. when you are sure that the first frame is unattached, loosen it from box on both ends and gently lift straight up. place in new box in same position. continue with each frame, only now you will be able to slide each frame over a bit after loosening it. this will help you not to roll the bees and kill them ( or the queen).
be very careful lifting. you may find a rotten or broken frame and they can be difficult to remove. sometimes you need to push them up from the bottom if the top bar is broken. save those for last. your box will be easier to lift. if you need to place any comb in new frames, use empty frames and rubber bands. place rubber bands on frames 1st.... 3 or 4 will do.... place comb in empty frame, move rubber bands over to hold comb, and place in hive.
if there are not 10 frames in the box, place your new frames with foundation, next to the brood.
if you are not sure what brood, honey, etc. look like, take a few minutes to look at some pictures on the web.
you have a smoker? smoke them some as you go, but not to much.
leave the setup in the place of the old hive until after dark. then close it up well and take it on home. make sure they have ventilation for the trip. screen the top, or use a screened bottom board and screen the entrance.