They'd be recognized immediately if anyone was seen using them in competition or in any bike club.
More likely the thieves will try to sell them to a competitor high end bike manufacturer who would probably turn them.
I know a guy who had a computer repair shop and copied a client's client data file and tried to sell the info to a competitor of the client. That competitor notified the client and the guy was busted.
Probably this.
I think I heard on the news that one bike has already been recovered, most likely the Specialized, which wasn't a drive-shaft prototype.