There are still 10 BTC sitting there as a reward to whoever can guess the 8 alphanumeric characters. (this one has pre-defined salt)
Do you mean "The WarpWallet Challenge 2"? Check the address, the 10 BTC was moved out in January 2018. The text also says that the challenge expires 1st Jan 2018.
https://www.blockchain.com/btc/address/1MkupVKiCik9iyfnLrJoZLx9RH4rkF3hnA