SPFolder attachmentsFolder = web.Folders["Lists"].SubFolders["List Name"].SubFolders["Attachments"].SubFolders[properties.ListItem.ID.ToString()];
foreach (SPFile file in attachmentsFolder.Files)
{
    byte[] binFile = file.OpenBinary();
    duplicate.Attachments.AddNow(file.Name, binFile);
}

web.Folders["Lists"].SubFolders["List Name"].SubFolders["Attachments"].SubFolders[properties.ListItem.ID.ToString()];

SPList objList = web.Lists["MyList"];

if(objList != null) {
    // Get the item by ID
    SPListItem objItem = objList.GetItemById(properties.ListItem.ID);

    if(objItem != null) {
        // Get the attachments of the item
        SPAttachmentCollection objAttchments = objItem.Attachments;

        //... code for copying attachements

    }
    else {
         //Log Error
    }
}
else {
    //Log Error
}