FOUND: one pair black panties. Seem to be in the style of a boyshort. Not 100% sure though since no one actually wants to touch them to find out for sure. Probably panties for a female, though males into crossdressing may also be interested in claiming them. Panties found on lower lanai, second tent from the kitchen, second pole from the end. Have been there for the better part of two weeks.
UPDATE: it was as if cosmically the owner of the pants/panties knew we were writing a bit about the unwelcome lower lanai decoration because hours after writing this (in its unpublished form) they disappeared! Hooray!!! Manifestation really does work… And obviously the picture is now only a reenactment!