That address has never seen any trasactions
https://blockchair.com/bitcoin/address/1CUxCZsiT7YbygEy8sJvJLcKDAU2jnhhkB
https://mempool.space/address/1CUxCZsiT7YbygEy8sJvJLcKDAU2jnhhkB

If thee were some they have been dropped by most nodes, so it's as they neve happened.
My advice would be to first contact your friend and tell him you've never got the funds, then ask him to either resend them with a higher fee or if he refuses to show you from which address and in what tractions he claims he has sent you those.