How do I determine where and if I received credit for a survey?

In your Activity section (found by hovering over your name in the upper right corner of any Swagbucks page and choosing “Activity” from the menu).  This is your Activity ledger that shows everything you have earned SB for.  To see just your survey SB earned, click on the drop-down (which will read "All Activity Types") right underneath Activity and select Answer:

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