Not Amending your 2018 Tax Return for missing 2018 W2's could have an effect on your current refund.
If you did not have sufficient federal withholding on the W2's that were not included on your previous return AND you did not amend that return, IRS could recalculate your previous return and hold a portion or all of your current refund.
The previous advice given to amend that return to include those missing W2's, was good advice to ensure that there are not taxes outstanding which could cause additional penalties and/or interest or reduced refund amounts in the current or future years.
I am including another Help Article with more details on Amending your Return: Amending my 2018 Tax Return
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