A plea for Ambassadeur help

I've just heard from a good collector friend of mine.

According to him, his friend who lives in the U.S. sold two old ABU reels to another collector who lives in Norway. Of all things, the two reels were stolen in the mail, and when the box was opened, there was a rock inside it!
We know the chances of finding the reels are slim to none, but we're asking for your help to keep a watchful eye if you see them show up on auctions you visit.

The reels are:

Record Ambassadeur 5000 #56759
Non-ABU 5000 #67714