It's not likely you'll see a viable Malaysian durian seed outside Malaysia. Not impossible, but unlikely, as Malaysia doesn't export their durians very far due to harvesting after fruit drop. They don't even make it to Hong Kong.

Not sure if the unthawed frozen Thai durian seeds are viable or not. But I'd give it a try. The non-frozen seeds are definitely viable.

And durian seeds should stay viable for longer than 9 to 11 days as long as they are kept moist.