I don't see SHRAP in my external wallet after transferring out. Was there a problem? Many wallets will auto-detect when a token has been added to your wallet. If your wallet is not one of those wallets, they may require you to add a token to your wallet so that it is displayed. You do this by providing the address for the SHRAP contract on the Avalanche C network, 0xd402298a793948698b9a63311404FBBEe944eAfD.
An example of how to do this on MetaMask, for example, can be found here - Connecting Metamask to Avalanche