I sent mine "Confirmed Delivery" from the UK. $10 extra odd and all went perfectly.
Try emailing [email protected] if you haven't already.
Already done back in February, also with their info e-mail. I'm getting fed up with them. I just used my work e-mail to see if my personal didn't actually in in their junk folder. They should of received my mailed one over 10 days ago (I sent on March 1st). I didn't use the tracking method as it is an extra 25$ for it, and I wrote my e-mail on both the TU033 paper forms to make sure they see it and send me an answer just like you mentioned. But I expect at least an answer via e-mail if it was approved or not, and the reason why, not a no reply.