River, 8 TPTK and missed flush draw

[ChuckNorris]

What do you make of this? It's a $55 at 3:30AM party time (~30k players logged in), so it might be a bit tougher than usual. No reads on villain this early during the tournament.

Seat 5 is the button
Total number of players : 10
Seat 1: fooooooo ( $910 )
Seat 2: luckylykmur ( $955 )
Seat 3: todkard ( $1025 )
Seat 4: ImuckJJ ( $970 )
Seat 5: dulcinator ( $1140 )
Seat 6: g4295 ( $955 )
Seat 7: Mulperi ( $1000 )
Seat 8: DealAway ( $1000 )
Seat 9: JohnSmiley24 ( $1000 )
Seat 10: Momusone ( $1045 )
Blinds(10/15)

** Dealing down cards **
Dealt to Mulperi [ Ac 8s ]
DealAway folds.
JohnSmiley24 folds.
Momusone folds.
fooooooo calls [15].
luckylykmur folds.
todkard folds.
ImuckJJ calls [15].
dulcinator calls [15].
g4295 calls [5].
Mulperi checks.

** Dealing Flop ** [ 4c, 5c, 8c ]
g4295 checks.
Mulperi bets [50].
fooooooo folds.
ImuckJJ calls [50].
dulcinator folds.
g4295 calls [50].

** Dealing Turn ** [ 2h ]
g4295 checks.
Mulperi bets [150].
ImuckJJ calls [150].
g4295 calls [150].

** Dealing River ** [ Jd ]
g4295 checks.
Mulperi checks.
ImuckJJ bets [300].
g4295 folds.
Mulperi folds.