I ask because it is probably no longer a secret today. The number of BFR basses and guitars is given on the homepage today. Klick
Look at the Stingray: "Limited to 89 pieces worldwide"...
In the past they have had limited runs that the numbers were announced but in general practice they haven’t given production numbers.
I have a 2010 BFR Stingray5HH that I got from Guitar Center. I believe they did a special run of those for GC back then and I don’t think they gave production numbers.