You found them all!
Starting on the second night of Passover, the omer is counted. The omer connects the holidays of Passover and Shavuot.
בָּרוּךְ אַתָּה ה', אֱלֹהֵינוּ מֶלֶךְ הָעוֹלָם, אֲשֶׁר קִדְּשָׁנוּ בְּמִצְוֹֹּתָיו וְצִוָּנוּ עַל סְפִירַת הָעֹמֶר. הַיּוֹם יוֹם אֶחָד בָּעֹמֶר.
Blessed are You, Lord our God, King of the Universe, who has sanctified us with His commandments and has commanded us on the counting of the omer. Today is the first day of the omer.
Great job on the scavenger hunt. Enjoy the afikoman!
Credit: Avital Pinnick, "Matzah Cliff", Blogged at apinnick.wordpress.com/2010/04/04/matzah-trek/; Licensed under CC BY-NC-ND 2.0