Maybe he has too many pm lately to reply due to his massive sale.
Chances to slip out 1 or 2 is not surprising. Maybe you can pm him with more clear title or a "reminder".
I hv sold my stuff here before and some is just titled "Corals" or "Fishes". Especially there's so many different variants and types that he's selling now, he may not know what you referring.
So lets practice some gracefulness here rather than just putting such remarks here.
Just my 2 cents worth.