וּבְי֣וֹם הַבִּכּוּרִ֗ים בְּהַקְרִ֨יבְכֶ֜ם מִנְחָ֤ה חֲדָשָׁה֙ לַֽיהוָ֔ה בְּשָׁבֻעֹ֖תֵיכֶ֑ם מִֽקְרָא־קֹ֙דֶשׁ֙ יִהְיֶ֣ה לָכֶ֔ם כָּל־מְלֶ֥אכֶת עֲבֹדָ֖ה לֹ֥א תַעֲשֽׂוּ׃
Au jour des prémices, quand vous présenterez à l’Éternel l’offrande nouvelle, à la fin de vos semaines, il y aura pour vous convocation sainte: vous ne ferez aucune œuvre servile.
Mishneh Torah, Daily Offerings and Additional Offerings
If they only found two sheep – and if they were to offer them for today’s musaf there would not be enough for tomorrow’s tamid – both options are equally valid. If they offered them for today’s musaf, it is valid, and if they wanted to leave them for tomorrow’s tamid offerings, they could do so.