Mine took over a month back in July/august timeframe. I had a further mishap where I followed the guidance of a YouTuber that said to put in a copy. So they opened 2 cases and 1 got closed saying I didn’t sign. Now recently I got a notice of action on the site(waiting to see what I get in the mail, yay). When they sent the duplicate back, ALL of the evidence packet came too, except the payment form. I have no idea what USCIS actually got from the lockbox, maybe 0 evidence so I’m going to get an NOID because none of my evidence was forwarded to them. I guess it will allow me to add pictures from another trip I made to visit my fiancé last year and formally propose to her.