To identify the web part ID, follow the steps below:
wpGUID=6ee19d6f-4ba8-4799-bda5-dc9c87bee158
If the report includes Query Parameters (e.g. a My Work report), they will be appended to the end of the web part ID and will appear after the &, - this additional text is not part of the web part ID.
For example:&CurrentUser=21