If you received a "refund" of your escrow account, that would not be reported on your tax return and it would not be taxable.
If I understand your situation, your lender has an escrow account that they hold for taxes and/or insurance payments.
The lender "estimates" what you should pay each month, and at times they estimate too high, which means you get some of your funds back. If this is the case, these funds were never used for a credit, so they are not considered income or taxable.
This situation would not warrant filing an amended return.
