Just wonder did you guys send in employment information when submitting your PNP application to Buffalo. In the checklist, it has a box to check for application form, pay of fee, provincial certificate.... However, the checklist has description of employment, education, and relative option without the small box to check. I didn't submit my employment information from the beginning. Don't know did you guys send it?
I don't know which province and stream you apply in PNP
But based on my understanding(i applied through MPNP-International student stream), you don't have to submit backup files for your employment history. Your local PNP office is responsible for checking your employment history, once they approved you, the approvement letter becomes an equivalent proof of your working history.