As we neared the final cache, low clouds swept over the peaks of the hills: first Pen y Fan, then Corn Du, Cribyn, and finally Fan y Big. It was the eeriest feeling -- perhaps the aliens were trying to obscure information that might lead to their discovery.
Despite this, we managed to locate the cache. We took the necessary evidence, in the form of a miniature torch -- surely not of this world; and we left a handmade bead alligator -- perhaps they would approach the cache through the thick fog and find this symbol of peace after we had left the site.
-- Agents Simon & Elizabeth