Fake or not. It's still money.
I once cashed $100k and brought it home just to see how it would look like.
Got yelled at by the wife... LOL ... then I couldn't put it back into the bank because didn't want them to think I was laundering money. Had to use it to buy stuff at the store. Slowly put some back into the bank too, a few thousands a month in cash. Been three years now, so guess I'm good. No FBI came to see me.