Must I file an amended return if I receive a late K-1 that does not affect my amount refund?

I filled our federal and state returns thinking we received everything.  After filing, we received a K-1 in the mail. The amounts were insignificant, but I plugged in the figures on it into TurboTax just to see. The Step-By-Step stated the information did not effect our refund. Since the K-1 did not affect my returns,  do I  need to file amended returns?