You have just arrived at the campsite, checked in and taken possession of your rental accommodation: you must therefore proceed with the inventory of fixtures. Even if it is tedious, it is preferable.
If the staff are not present, do the inventory anyway to check that nothing is missing from the list you were given. Basically, count the spoons! Do not hesitate to report any anomalies you notice (missing items, cracked window, dirty oven) as soon as you arrive.