Harold,

They do not badge the cars until it reaches Ground Effects. Badges have nothing to do when there were built only when they were badged. I haven't spoken with Budman, as of this time. Your cars paperwork will not reference badge # in any way, so technically they mean nothing. Only people in the know will recognize this but it can be proven easily, but you would need (2) pieces of paper work showing build dates from separate vehicles. They could be built same day but ran through GE in different sequence.