>I have no idea how one would prove this one way or the other, unless someone finds some very old A.m.m. well-preserved in a peat bog somewhere.
Prove might be hard, but here are a few anecdotes that help tie a couple of thread offshoots together.
A great presentation by Grace McCormack IMHO follows- at about the 45 minute mark she begins discussing current AMM distribution and refers to a distribution map that is in a 2018 paper that is also included below:
https://youtu.be/JPr6ny-y_kEhttps://www.tandfonline.com/doi/full/10.1080/00218839.2018.1433949
One of the study participants is fourth-generation beekeeper Eoghan Mac Giolla Coda- in his BIBBA talk from this Spring he talks about working with the native bee. At about 39:30 he discusses the techniques he uses to assess 'nativeness':
https://youtu.be/gPF8OLdEvoU
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