Maybe the original book, small inner box for attachments in good shape and oil can? It still seems very high to me. I have noticed that ebay actually seems to have depressed the prices because they are coming out of the woodwork now that every one knows they are valuable. When I first saw 2 for sale they were $450 and $500.
I got mine for a really good price, but she's no movie star, her box is scuffed, handle worn, decals worn, paint a little worn and the box was musty...altho right now, it's open with coffee grounds in it, thanks to another thread. Plus we couldn't get her to stitch so we got some off for that. I love her, but I doubt she'd go for $700 or even close, even tho I have at least one of almost every attachment, including zig-zagger and an original penguin walking foot