Resident permit cases can take a long time (see here). While you wait for a decision, you may need to leave home for a few days. Whether it’s because of holidays, family visit or any other reason, you definitely should take precautions to ensure that you won’t miss any requests from Urząd Wojewódzki. Otherwise, it is possible that during your absence, Urząd will send you a letter and you won’t be at home to pick it up. And this may result in negative consequences (you can learn more here).
As I mentioned in one of the latest articles, in Poland any important letters are being sent only by registered mail (list polecony). This guarantees more certainty that the letter will reach the addressee and allows the sender to monitor the delivery status (on the page https://emonitoring.poczta-polska.pl/?lang=en).