$3/$5 NLHE you've just sat down and have a $300 buy-in and haven't been very active.
The table is fairly deep with four players over $500 and a couple over $1k.
You make it verbally $20 with AK from MP.
2 reasonable players call.
SB is a rather loud kid who's been in about half the pots in the last orbit or so. He's got about half a dozen $100 chips and around $100 or so in $5 chips.
The kid kinda laughs while smiling and says "I make it $80" and counts out most of his yellow (CA $5) chips.
Folded back to you.
What has likely happened at this table over the last couple hours? How did the kid likely get such a oddly chipped stack?
What's his range?
What's your play?