I see the second poster listing has been withdrawn, "because the item is no longer available."
I also noticed the same staining at the bottom, and guessed that they may be using one set of photos to sell similar posters. For that matter, the poster is shown on a wood-paneled wall that could be anywhere.
Both listings state that "...Theme Park Connection is auctioning off an entire collection of actual Signs that were displayed at the Disney Parks and Resorts..." Also, the medium is stated to be "Paper with textured glossy finish." The seller does NOT claim that these are original Rudy Lord serigraphs, nor is it stated WHEN
these were displayed. Based on the seller's language, these might be what Mike (WEDWAY67) referred to as:
"...The ones that have been on display for historical exhibits and inside Fort Wilderness today are neither ORIGINALS NOR original souvenir 70's posters, they are modern copies made by special services for WDW decorating copies from an original silkscreen..."
I would hate to have spent over $1700 on a Disney-authorized repo.