I just received my first order from them yesterday, and they mailed the impressions back to me. Did they not send yours back to you? I've heard they keep them on file, but maybe someone else can chime in.
That's really interesting - I would maybe try and contact the lab directly if you are able. I ordered a twin block appliance.
I saw in your other thread that your appliance didn't fit well - did you have any luck with that? I need to contact them about making an adjustment to my new appliances.
Strange I have tried to contact them but no luck in getting an answer yet. I have got used to it now it is so hard to talk with! Would you want to see pictures?