"t looks like they are coming and going"
okay steve. do you see any bees going to another hive in your yard?
robbers will come and go as well. it seems kind of 'frantic' in front, and not bees traveling up and down the hive as in normal orientation flights, and these can get rather busy as well. when bees orient, they fly out, and fly up and down, and in the localized area facing the hive and remembering their location and fly back in, and may do this a number of times.
you said the hive was a week old, was this from a divide or a package of bees you hived? and what is in the hive for feed/sugar syrup?
if you see bits of wax on the bottom board, or dead bees, or on inspection chewed/torn comb this would be robbing.