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Sister-in-law anon here. I've gone through everything and it looks like I've got
>4566: Gear
>4567: Surfer
>4569: Warrior
>5921: Research Glider
>6091: King Leo's Castle
>6617: Tough Truck Rally
>8251: Sonic Cycle (Built as the alternate model so it was a bit hard to ID at first)
>10040: Black Seas Barracuda
>Two Blok Bots (Ice and Swat)
I also got some instructions for other Race sets (6602 and 6519), a bunch of Freestyle Parts, and a few parts from the Gungan sub (Mostly the canopy pieces, but only like 10% of the thing). I think the only sets that are actually 100% complete though are the Sonic Cycle, the Xalax racers, and the Blok Bots. The Barracuda and Castle are missing minifigs (No sign of Redbeard or the monkey, and I found the skirt and headdress of Queen Leonora but not the head and torso), and I have a hunch I'm missing a bunch of parts like the projectile launcher from the castle, but on the upside the sails are still factory sealed and I found most of the rigging. Overall pretty good haul.