Quote from YAJRN
A nurse had already been given packet 2 and waiting for packet 3. However, many months have pass the packet 3 didn't arrive. The recruitment agency contacted the NVC, then the error have been made, the NVC thought that that the nurse was already in the US and just changing the status. Thus, they didn't send the packet 3 form.
Does the NVC commit mistakes like this?
Sounds like something fishy with the agency/attorney, not the NVC. Have seen it happen many times, the agency did not pay the fee for the visa bill and are trying to put the blame on someone else.
And more importantly, there are two differnt sets of documents that are used, only the I-140 is the same for both, but then they become different.
So, if had to make an educated guess, it was the agency's fault, not the NVC. They can only make a mistake if the wrong documents were given to them, they do not make up paperwork.
But I can almost bet that the visa bill was not paid, and that is why the nurse did not receive the packet 3.