Jeff,
I haven't used the Request Data Copier DPH/filter on the Responder step so I can't confirm whether it will work as you expect it will on Response object in the Responder step, or if it's limited to Request objects in the Listen step.
However, the following approach will allow you to access the HTTP-Response-Code value:
1. Add Scriptable Data Protocol Handler on the Responder step (Right click Responder > Add filter > Virtual Service Environment > Data Protocol Handler. Select Scriptable Data Protocol from drop down)
2. Type in "lisa.vse.response" into the "Filter in" field
3. Select "Process Responses" radio button.
4. Select "Response - Playback" tab. It should be configured as shown below:
5. Type in the following script:
%beanshell%
// You can use %beanshell%, %groovy% or %javascript% or some other installed JSR-223 scripting language
// This example is for beanshell
import com.itko.util.ParameterList;
// Metadata is a ParameterList
ParameterList metadata = lisa_vse_response.getMetaData();
// Access meta data using the key HTTP-Response-Code
String responseCode = metadata.getParameterValue("HTTP-Response-Code");
// save it into a property
testExec.setStateValue("HTTP_Response_Code", responseCode);