You can try beelining them. Make a small amount of syrup, add scent to it with something like anise, and get a little powder handy. Put this in a matchbox, or some other small container (there are many manufactured beeline boxes. Set this out for the bees to find. Check the box, sprinkle the bees in it with powder, close them in and walk about 50 to 1oo yards. Let a couple bees go and see where they head to. Move along another distance and let a couple more go... track their direction. Move another like distance, set the box up to trap some more bees, and start the process over. There are many variations, timing a marked bees go and return time, triangulating, etc, etc. Should lead you in the right direction to find them.