Our wildlife rescue is real good about patching things up and letting them go in the area they were found. The only thing I had them come out for was a hawk with a broken shoulder but I've taken in several birds that were either babies or obviously sick and they just make you write where you...
If you think it's 'catchable' I would call wildlife rescue. They can observe and do tests for parasites and diseases. That'll give you a better idea whether your geese could bee exposed.