I am sure if you contact Envato support they will be able to tell you where it is and/or forward your mail to your reviewer directly
Do you mean you bought an item on here and it’s gone from your Downloads page now?
Or did you upload an item because you want to sell it and it has not been approved yet?
If you bought an item you want to contact Envato support and ask where it is.
If you uploaded an item check your spam folder for a possible rejection email. Or check your author dashboard for a possible “held by review team”. Or contact Envato support and ask for it