@mesquitebean
Ah okay, I'll hope CA FTB does have it in some pile somewhere. It seems weird to me that they could receive certified mail without acknowledging it, but admittedly I don't know the intricacies of certified mail. I will probably call the post office to see if they can check on it.
Thanks for the link to check the status! They don't have it, but say not to contact unless it's been "3 months since you mailed your return". So I'll mostly just wait, and hope I won't get in trouble for missing the deadline if the envelope is lost after all. Hopefully they'll be cool since I don't owe money...
