Can you send a screenshot of your model and conditions you have defined for this component?
There's two main ways to set a default field value:
1.) In your model condition, set a condition such that:
Date_Received__c = TODAY
Remember to uncheck "Load Model Data on Page Load" and check "Create Default Row if Model Has None" in this scenario.
2.) Using the action framework to launch your Search component, use an "Update a field on row(s)" as one of the actions. Likewise, remember to uncheck "Load Model Data on Page Load" and you can use the action framework to create a new row when launching this component.