Ozamataz Buckshank -
I live in Chester county and haven't gotten any kind of work slip. It seems to be dependant on the company. There were a fair amount of people on the roads past 8 last night and I didn't see anyone get pulled over so I'm not sure whether the police are really enforcing that yet.
Employers may or may not issue that documentation, and it may or may not be "required".
There is a list of essential and non-essential businesses. We have not gotten any formal direction from our corporate offices, so we printed out the lists and highlighted our business designation, ourselves, just in case anybody stops us. This is mainly for our drivers, as they are the ones doing deliveries and who have to stop at weigh stations. Not sure what you do, but it might be worth at least printing out that list.