Here is the watch for sale again on eBay with the correct case back installed. I questioned the seller about the incorrect case back and this was the reply:
"I purchased the watch in 2012 from Torneau in San Jose ca. I didn't realize the back did not match until you pointed it out to me.
It was never found out what actually happened or how it happened. I was just happy to get the problem resolved.
I took it to Torneau in San Francisco and they shipped it out overseas to the Breitling center, I believe it was in Sweden. They cleaned the watch along with replacing the battery and replacing the back cover with the proper back."
http://www.ebay.com/itm/BREITLING-MENS-GRAY-AERO-AVENGER-SEAWOLF-CHRONO-MODEL-A73390-/181873180131?hash=item2a587c7de3