You can ask for the packaging of the new part just like you would with the mechanic that fixes your car. That way they have to show you the box or bag that is marked with the exact part. Make sure and say that up front. Most service centers do not stock "new" parts because hardly anyone brings a "new" machine in for service and there isn't a ready supply of aftermarket parts for sewing machines. So over the years they accumulate the bone yard to help keep all of our wonderful vintage machines up and running. I serviced machines for 5 years and we always asked our customers if it was ok to use a used part and most agreed and were just happy to get their machines back home in working condition. However charging a new price for an old part is illegal. It would have taken me about 2 seconds to ask for the owner and complain loudly.