I got the procedure to work using Jigidon’t comment from “25 July, 2022.” The first time I solved it I wasn’t human enough but I solved the 589 puzzle it in 30 minutes. No completion message. Did it again, this time laying the pieces out in a grid and then assembling the puzzle more naturally and got the message. That took 1:45. The puzzle probably would have taken 5 hours if I didn’t “cheat” so I guess that is a win. A lot of trouble for a cache I probably will never go find.