Is there a way for me to check out Costco as s gues to see if I found values in a membership?

Yes, you can ask Customer Service for a guest pass.

Yes, I believe they do that.

Yes you go to the customer service desk and ask for a shopping pass it's only for that day and reason.

Yes, ask for a guest pass at Costco Customer Service Counter.

Yes you can enter as a guess. Not allowed to make purchases