So sorry to hear!
A couple months ago before Christmas, I lost a new 5D3 in the box to a guy I was selling to on Craigslist when he literally ran off down the street with it without paying.
Well, I took possession of it yesterday from the court. Turns out, another guy pawned it 45 minutes after he stole it. They contacted me because I had provided the serial number in the police report. Unfortunately all the box contents were missing including the eyepiece but at least I got the camera itself back in pristine condition.
I hope you possibly have the serial numbers so that recovery might have a better chance. So sorry! I definitely can relate. Good luck! Keep us posted!