I have a Givi Monolock topcase available (replaced it with a larger one). I don't think this model is available anymore, but this is newer version for comparison.
It has a 26L capacity and Givi states that it holds one helmet. It did not however fit my Seven-Zero-Seven size XL full-face helmet. It was close though so it may fit a size Large or smaller. It also has the additional backrest that I added. Everything is in good condition with only normal signs of wear after ~1 year of use. Comes with two keys and the universal mounting plate that I did not use.
I paid ~$90 for the case and backrest together, looking to get around $50 now. Shipping is the problem though. USPS came up the cheapest at just under $40 from LA to Boston (as an example). If you're interested let me know and I can get a quote to your zip. If you're around Los Angeles than we can work out a local exchange.
Below is the only photo I was able to find that I saved with the box on, sorry it's a bad pic. Here is a link to someone else's photo that I came across as well; it's a 35L though, whereas mine is 26L. Similar shape, just a little bigger.
Shipping to 40272 comes up as $38.21 via USPS standard post.
For reference, the shipping box dimensions are 20"x18"x15" and 8lbs 7oz.
The universal mount, will it work with a 919 or will I have to get brackets else where?
The universal mount that it comes with is just the base plate (this), for use with flat luggage mounts apparently. I purchased the Givi topcase rack (FZ256) which came with a Monolock base so I never had any need for the universal base that came with the box itself. Not sure what specifically the universal mount can be attached to.
lemme ask this, will it plug and play if i just remove my stock grab-bar?
Short answer... no, because the tail isn't flat. Basically you can use the universal mount to attach to any flat surface, so if you can mount a board on top of your tail section then you can screw this mounting plate to the board.
Maybe there's a way to get the plate directly attached to your tail, but certainly not plug and play.
Throwing this back up there. I've been going the Craigslist route, but it's amazing how many people don't realize that the case doesn't just magically mount to their scooter or bike without some sort of rack, or they think they're getting a rack too for the $50. Wouldn't that be a sweet deal.
I'm not in any hurry to get rid of it, but just want tbe community to know it's available.