I am not sure whether you know my attitude about sound samples. I find them unreliable in so many ways, and not representative of how we use these mics, and therefore unsuitable for any serious analysis.
The first thing I would do is authenticate the capsules: if you want to know whether they are original, you need to open the baskets, take close-ups and post them. Anything short of that is speculation not helpful in your query.
As far as the sound of original Berlin-M7 goes: I have not encountered a single one in the last five years that still performed at the noise floor or full bass response of a healthy M7.