Ethereum: The Blockchain, Transactions, and Explorers

Hi All,

I am super stuck on question 9' After completing the previous question, a certain number of ETH was sent to your wallet. Using the blockchain explorer, what is the address that sent you this ETH?'

I have input the labs wallet ID into the block explorer but I cant see any transactions to trace where the ETH has come from. Am I being stupid or is something not working?