Emily,
I believe you have the best interests of the animals at heart so when the results of the tests of your animals are in, post your results... it will leave less to conjecture.
Unfortunately without ruling out all other possiblities... whether the parasites happened at your place or Eds is a coin toss. It is possible that this may not even be answered 100%, but chances are better if you make the first move since you are the OP.
Sadly, Ed doesn't seem ready to post his tests, but that shouldn't stop you from posting yours. After seeing that the status of an animal- WC or CBB doesn't necessarily mean diddly when it comes to parasites... the stigma of the accusation shouldn't be that this is a business ender for ANYONE... only a headsup to fix an issue, and tend to the snakes, right?
After seeing the facts behind how parasites are transmitted:
1- Test all animals no matter if WC, CB or CBB
2- Random retests should be done if any live feeders in even a closed collection
With that being the case, then there really is nothing negative about this thread towards anyone & just an eyeopener to all to be vigilant in the keeping of our snakes, right? This could have happened to anybody.