Yes, it's typical. For one, you don't want people disturbing sensitive sites that may need to be revisited periodically. Things that have the allure of value te

Yes, it's typical. For one, you don't want people disturbing sensitive sites that may need to be revisited periodically. Things that have the allure of value tend to make otherwise reasonable people greedy and come sniffing around for things to loot. It's not hidden from anyone with credentials or the government, just the general public.