I was very happy with 2 but 5 wow.
Yep....It is funny how we obsess over matters that were just happenstance or casual actions by auto workers many years ago. Can you imagine going back in time to tell them how important a paint dab or a grease pencil mark would be in 50 years? They'd think that we are idiots!Sadly with the decent percentage of Build Sheets found in cars, a much higher importance on having them has been placed, where the BS's were never really intended to be left in the car to begin with (from what I have read over the years).
It has become expected as part of a cars' pedigree that a BS will accompany all the documentation to validate authenticity.
Finding them all depends upon the factory that built the car, the workforce in that factory, company policy at that factory, the mindset of factory workers, and sometimes...sheer luck.
My friend with the '70 Chrysler 300 Hurst has 5 x BS on his car. That is the highest number I have ever heard of.