My guess would be his scaleless corn Solana since it was a worlds first.
Looking back at my records I'm about $4,200 into 34 snakes plus $500 for shipping. Most of my snakes are corns and sub $100. If I had to replace them all at full market value it would be about $6k-$7k. I've gotten a bunch of end of show deals, some the value of the snake has increased, some I got for free as pet only because of kinks, I've also gotten a breeding pair of corns for $20. That total is just for the purchase of the snakes and not the extra cost of caging, heat, thermostats, hides, bedding..etc. I have no clue how much my wife has tied up into her crested and gargoyle geckos.