Chas,
Are you using a workspace for deployment? It may be that you have included a directory with these temporary files in them at some time. However, they ARE temporary and are eventually removed or replaced. These files are generated if you have "Use Temporary File" selected in the Report Options. It appears that they are in some directory that is included in your deployment.
You will not have any problems if you remove them from your workspace or deployment directories. Again, the files are temporarily created by the Process Model during Report Generation. They are not needed by your Sequence File.
Regards,
Tyler