The FBI has released their files on him.
I only read about 110 pages of the 280 page file before I got bored and quit reading. It has a lot of redaction, a lot of reduntancy. I didn't see anything about poker. It has some stuff about his invovledment in a murder attempt, in fixing a horse race (that part is so heavily redacted you can't figure out what they're talking about), his Las Vegas fencing activities, and sports betting. It's all pretty superficial.
But if you really can't find anything to do one afternoon you might want to download it. If you see anything actually interesting in it, let me know.