Hi Ronbo,
I looked at SIN11 July about an hour ago.
For the 40P I got a "last trade value" of 1650. I thought maybe I misunderstood you but it did expire on 5/25 as you mentioned.
The ATM Puts or Calls one strike OOM were 12k and change.
Anyway, good luck with it !!!
BTW
Looks like SIN has stabilized and GC popped up a bit as Dx started falling off again. Looks like Dx may just be "yanking" them around a bit ???
Lee