I am not familiar with the Eugene airport particulars.
Here is the normal process:
- Track the cargo to assure it is on the flight
- Freight charges MUST be paid prior to pickup (if not ppd)
- Go to the cargo department
- Government issued ID
The freight should be available within an hour of arrival.
The rock will normally be in waxed cardboard boxes covered in damp paper towels or similar. There is no reason to rush but you should have a container of preheated saltwater prepared at home.
Exactly how to proceed and the time depends.
Is the tank cycled or will you be using the rock to cycle?
If your tank is uncycled then rinse with fresh salt water and get to aquascaping:)
If your tank is already cycled.....
Place the rock in the container with a robust powerhead. Leave it there without light for about a week and check for odor. If you smell die off let sit for another few days.
Rinse and inspect for unwanted hitch hikers.
Finally, ENJOY!