You only need one or the other (I prefer Prime) to add to the water in the bag - it will bind ammonia while you are acclimating. Prime also helps to detoxify nitrite, not sure about Ammolock.
This fish would have had a better chance in winter, but I think it's highly unlikely that a 5" fish will be alive after a summer weekend in a shipping facility.
You should have a tracking number - did you pay extra for Saturday delivery, and did the shipper request it? If the person who shipped the fish did not request Saturday delivery, it is absolutely his fault. Most people don't do this because it can double your shipping cost.
If the fish shows up alive it will be highly stressed. Hopefully it is going into QT by itself. You will want to add salt, 1 teaspoon per 5 gallons and I would QT for a full month.
Best wishes.