Vintage 1986 Transformers promotional costumes found
Posted on twitter, and mirrored here, are two Transformers costumes that were used in promo events and commercials... such as at the 6 minute mark of this youtube compilation of Transformers toy commercials... Jazz and Thundercracker.
They were found in a warehouse storeroom of a comic shop in America, and appear to have electronics to alter the voice of the users.
These are like museum pieces, and if they were ever sold, I think they would see some record prices for Transformers, as there would be a lot of well-funded Gen1 collectors around the world wanting the bragging rights of owning one-of-a-kind "Hasbro" items from the 80s.