Someone bought a piece of Grand Theft Auto IV history for roughly $13 at a car boot sale. That purchase has now produced what many are calling the biggest GTA IV leak in the game's 18-year history, complete with a pre-release beta build, cut assets, and the remnants of a zombies mode that never made it to launch.
A tenner at a boot sale that changed everything
The man behind the find goes by Jan. He told Kotaku he visits car boot sales regularly, both to resell items and build his personal collection. On one of those trips, he spotted what looked like a chunky Xbox 360 with something unusual bolted to the side. He initially assumed it was a modded console, but when he picked it up, a Rockstar North sticker told a different story.
Jan lives in Edinburgh, the Scottish city where Rockstar North is based. That sticker was enough to make him ask the price. The seller said five pounds. Jan handed over ten and walked away with change.
The extra piece attached to the unit turned out to be a "Sidecar," the expansion hardware found on Xbox 360 developer kits. A quick check of the serial number at home confirmed it: Jan had a genuine Rockstar North dev kit sitting on his desk.
What was actually inside
Here's the thing: Jan openly admitted he is not a big Rockstar fan. He played some GTA V at a friend's house as a kid but has never gone back to it. He had no specific expectations for what might be on the drive. What he found was far beyond anything he anticipated.
The dev kit contained an early beta build of Grand Theft Auto IV, a library of cut content, unused assets, and the remains of an unfinished zombies mode that was apparently scrapped before the game shipped in 2008. The files represent a firsthand look at a version of Liberty City that the public has never seen, with content that had only ever surfaced in fragments through old screenshots and developer interviews.
The beta build and its assets have since been uploaded and shared widely across the GTA fan community, which is now spending considerable time cataloguing everything inside.
The dev kit also contained a program called "Dolphin.xex," a basic original Xbox software demo used by developers during hardware testing. Despite sharing a name with the popular Wii emulator, the two are completely unrelated.
The seller, the scrapyard, and the language barrier
Jan told Kotaku that the person who sold him the unit is a regular at that particular flea market, typically offloading old electronics. Jan suspects the seller sources hardware from scrapyards or e-waste dumps, but the seller was not forthcoming with details. Through Google Translate, Jan managed to learn that a contact in another city "supplies him with this stuff." That was about as much as the conversation yielded.
The key here is that nobody involved in the sale appeared to know what they had. The seller priced it at five pounds. Jan bought it on instinct. The most significant GTA IV beta archive to surface in nearly two decades changed hands at a weekend market for less than the cost of a pint.
GTA IV pre-release beta content
What Jan plans to do with the hardware
Now that the files are online, Jan is weighing his options for the physical unit. He listed it on eBay with an $800 Buy Now price, which sold fast enough that he pulled it back and relisted as an auction. eBay eventually removed the listing, likely due to the presence of the "Dolphin.xex" file triggering an automated flag tied to emulator-related content. Jan has since received a private offer of around $1,270 (roughly one thousand pounds) and is keeping the sale off eBay to avoid further complications.
For the GTA community, the physical fate of the hardware matters less than what has already been extracted from it. The beta files are out, the cut content is being documented, and researchers are picking through assets that Rockstar shelved before most players had even heard of Niko Bellic. For a game that launched in April 2008, that is a remarkable amount of new material to surface in 2026. For more on the gaming world's biggest stories, make sure to check out more:
