My AWS dynamoDB has id as Partition key and there is no Sort key. The following does not return the existing record from the table:
response = producttable.scan(FilterExpression=Attr('title').eq("My Product"))
response['ScannedCount'] is less than the total count of the table.
You need to pagĂnate.
For example code look at https://github.com/aws-samples/aws-dynamodb-examples/blob/master/DynamoDB-SDK-Examples/python/WorkingWithScans/scan_paginate.py