If you can get the TXID and it's not on the BTC network here are some explorers for the other chains:

Binance Smart Chain Explorer (bsc) = https://bscscan.com/
Binance Chain (BEP2) Explorer = https://binance.mintscan.io/

As others have stated without the TXID or even knowing what chain they sent it on you don't know if the other people ever really sent it.
But if they did not send it on the BTC network then the coins are probably lost forever.

-Dave