Yes, you do need to report that amount.
I assume that you are not on Medicare? The moment you go on Medicare, you will have to stop receiving contributions from any source to your HSA.
Since you don't have a W-2, you will have to do the following to report the HSA employer contribution:
1. enter the HSA interview (do a Search (upper right) for hsa and click on the jump-to link)
2. proceed forward until you see "Did your employer tell you about any other contributions?"
3. click on "Yes"
4. three new lines should appear - the third one is "Employer and payroll contributions not reported in box 12 of your W-2"
5. Enter the HSA contribution amount here. This will be reported on your 8889 on line 9.
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