The Winco Foods phone number is (208) 377-0110. If you explain the problem to them hopefully they will be able to put you in touch with the
If, for some reason, you can't get through by phone, you might want to try writing to them instead. Their address is:
Winco Foods LLC
650 N Armstrong Pl
Boise, ID, 83704 United States
Wait for a reply and then respond with the details they request. Generally, just your name, address, and the branch that you work/worked at will be enough for them to help you. Keep a copy of the letters that you send to them. If you don't get what you are looking for you might need to seek legal advice and copies of correspondence will help.
Good luck, I hope you get your pay stub soon.