Biggest check you can get that banks don't report to IRS?

[Chesskid1]

This is NOT about how to not pay your taxes, I haven't been keeping track of poker winnings, but i'm trying to fix that, and I don't want a $10k check being reported to the IRS when i'm trying to figure out all my money won and everything for when I file taxes everything works out okay and there isn't some rogue high amount $$ checks that I have to explain to the IRS. I am 100% paying my taxes. Something like I could go bust online, have to use the $10k, lose it, then have to pay taxes on it, you know?

I am looking to get off around $20k on stars, and it looks like i'm just going to do it by check (looks like basically my only option). One friend told me that all checks over $10k are reported. Another told me it's $5k on over. Does anyone know for sure? I have Chase if that matters. thanks.