Actually, an update on this...Same here, but it was due to some dealer negligence resulting in an ATF audit that resulted in the ATF kicking back over 100 Form-4's (including 1 of my 3 with that dealer). I got my other 2 back in August, and the 3rd should have been approved right there, too, but it never came, and that's when I found out about the audit and all that crap. So, I'm at over a year now since purchase for a can that should have been approved back in August.
After posting, I called and talked to the ATF to find out my status on that one can that's over a year now. The lady who answers the phone was nice, but she wasn't able to help. So she transferred me to the examiner who approved my first 2 Form-4's with that dealer, and was the person who gave me all the inside info about the audit, long before any of us outside of the ATF/dealer loop, was contacted by the dealer about the audit. She's a very nice lady and has always been very helpful. She did some quick searching, and found out that my re-submitted Form-4 had still not been assigned to an examiner after 2 months of check cashing on a re-submittal that was supposed to have been expedited on a 1 month turnaround.
So, apparently someone dropped the ball at the ATF and didn't put it in the right pile. Go figure! Just my luck! If I hadn't called, it would have probably gone through normal processing again, and taken another 6+ months before I got it back. Luckily, she's really nice and helpful, so she requested the file to be sent directly to her, so she could examine it, and said she should have the file, run the check, approve it, and get the approved Form and stamp over the mailing center in the next 1.5 weeks.
I just wanted to share this info, because it blew my mind with them going above and beyond to help.