If there were not taxable scholarships or grants, you do not have to amend.
If Box 5 is more than your tuition, it may be treated as taxable income and you should amend to avoid any penalties or interest that might be calculated on an underpayment or excess refund.
However, if you didn't claim any education credits because you didn't have the 1098T when you filed, you should amend if you want to see if you qualify for any additional credits or deductions.
I am including some information on Amending your returns as well as more details about Education Credits for which you might qualify.
Available Education Credits Education Credits
Tuition and Fees Deduction Tuition and Fees Deduction
How do I amend my return? How do I Amend my Tax Return?
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