Dear Aaron,
I would like to remind you that at the time of joining in a hurry, people often make this mistake. If I am not mistaken, you might not have asked for an acknowledgment for your certificates from your employer/HR of the company. If this is correct, how can you prove that your certificates are with them? Both you and your employer have been comfortable all this time, and you have not realized it. Now, as you have quit the job, the issue of legality has come into the picture. If you have acknowledgment, then you can proceed legally; otherwise, somehow you have to manage and retrieve those certificates.
Regards - Kameswarao