These are modern stamps and are currently not worth more than postage. I would not use them for postage, if I were you, because I think stamps like these will be worth something, someday, especially in sheets.
I wouldn't say they're worthless. They are full sheets with the plate numbers at the bottom. I think they would be likely to appreciate, especially around the next milestone celebration in 2026, so put them away for another 19 years and see what happens.
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Gary