How were the artifacts from different time periods acquired for storage inside the pyramid?
Indy states that the ETs were archeologists. The likely explanation is that the extraterrestrial beings were time-travelers, traveling through the time-space continuum to acquire the “priceless” artifacts. i.e., widely diverse statues, jewelery, pottery, and structure artworks ranging from Sumerian to Early Egyptian to Roman to Early Chinese, etc.. Extraterrestrial beings are presumed to be always curious, hence visiting Earth to investigate organic life and gain knowledge by contact with the human race in ancient times as well as to acquire artifacts as gifts or by theft.
