Metal shavings in my transmission

I don’t know if they are lying to me about what happens with the transmissions they take out. I have the invoices and I have had another VW garage look and tell me they are “new” (could be rebuilt but new to my car)

Thanks, but what I really am looking for is ideas about what mechanically is causing there to be metal shavings in the transmission. I know it would be a great help if I could say where the shavings are coming from, but I can’t get that information no matter how many times I ask.