The source is from the manga Blue Period. For further context, students were split into teams to make curry, and whichever wins will get money for prize.
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2Is your question more about the meaning of 金一封 (since you write "whichever wins will get *money for prize*" so it appears to me that you already know what it means), or more about the meaning/usage of the past tense もらっ**た** ? If that's the latter then your question should be a duplicate of [this](https://japanese.stackexchange.com/a/73852/9831) and [this](https://japanese.stackexchange.com/a/85795/9831). – Chocolate Jun 19 '21 at 10:10
1 Answers
Your question has a slight typo that is hard to see -- you've used ー, Unicode codepoint 30FC, the 長音符【ちょうおんぷ】 or 伸ばし【のばし】 mark used to indicate a long vowel. In vertical text, this is always a vertical line, so we can tell that the correct character instead is 一【いち】, Unicode codepoint 4E00, the kanji meaning "one", which is always a horizontal line, even in vertical text. In horizontal text, these two might look identical, depending on font, but copy-pasting these into online dictionaries will give you very different results.
In your manga text, we have the word:
- 金一封【きんいっぷう】 (literally "money one envelope", i.e. an envelope of money)
(Links go to the relevant entry in the Weblio E-J / J-E free online dictionary.)
In other words, someone got an envelope with money in it, probably a traditional gift looking a bit like this:

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@aguijonazo: Ha! Never even occurred to me that that would be a single integral term. Thank you! I'll update my post. – Eiríkr Útlendi Jun 18 '21 at 22:45
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3`someone got an envelope with money in it` -- ん?まだもらってないです。その「もらっ**た** 」は、「優勝賞金はもらっ**た**も同然だ」「(うちのチームは)優勝し**た**も同然だ」って意味です。ところでその封筒は結婚祝用だから普通はこんなやつ→https://www.google.co.jp/search?q=金一封%E3%80%80賞金&tbm=isch&ved=2ahUKEwjAnIjH1aLxAhURzIsBHUNGCLAQ2-cCegQIABAA&oq=金一封%E3%80%80賞金&gs_lcp=CgNpbWcQAzoCCAA6BggAEAQQGFCVxQFYodMBYNDXAWgAcAB4AYAB5AOIAeARkgEJMC41LjEuMS4ymAEAoAEBqgELZ3dzLXdpei1pbWfAAQE&sclient=img&ei=11jNYIDVLZGYr7wPw4yhgAs&bih=694&biw=1517 – Chocolate Jun 19 '21 at 02:41
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2(cont.) この「た」です:https://japanese.stackexchange.com/a/73852/9831 / https://japanese.stackexchange.com/a/85795/9831 – Chocolate Jun 19 '21 at 02:54