Thanks for the reply. Yeah, I have the addresses I sent them to. Ill post them tomorrow if it will help. Both were sent in the same day so I think they will both have been sent to the same exchange. Ive checked binance as I thought it was the most likely, but I have no transaction history on that day.
You can try other well known exchanges like cryptopia, Okex, hitbtc.com and gdax.
Here is the other list of exchanges
https://coinmarketcap.com/currencies/bitcoin/#marketsAlso, check your email and maybe you can find the exchange site in your email inbox.