There is indeed a traditional prayer and procedure to be followed when seeking G‑d's assistance in retrieving a lost object.

The following is recited:

Rabbi Binyamin said: All are presumed blind until the Holy One, blessed be He, enlightens their eyes. We know this from the verse:1 "G‑d opened her eyes and she went and filled up the water skin."2

(Say three times:) G‑d of Meir answer me!3

In the merit of the charity which I am donating for the sake of the soul of Rabbi Meir the Miracle Worker may I find (---) which I have lost.

Here is the prayer in the original Hebrew:

אָמַר רַבִּי בִּנְיָמִין: הַכֹּל בְּחֶזְקַת סוּמִין, עַד שֶׁהַקָּדוֹשׁ בָּרוּךְ הוּא מֵאִיר אֶת עֵינֵיהֶם
מִן הָכָא: "וַיִּפְקַח אֱלֹהִים אֶת עֵינֶיהָ וַתֵּרֶא בְּאֵר מָיִם וַתֵּלֶךְ וַתְּמַלֵּא אֶת הַחֵמֶת
אֱלָהָא דְּמֵאִיר עֲנֵנִי, אֱלָהָא דְּמֵאִיר עֲנֵנִי, אֱלָהָא דְּמֵאִיר עֲנֵנִי
בִּזְכוּת הַצְּדָקָה שֶׁאֲנִי נוֹדֵב לְעִלּוּי נִשְׁמַת רַבִּי מֵאִיר בַּעַל הַנֵּס, זְכוּתוֹ יָגֵן עָלֵינוּ, לִמְצוֹא אֶת (---) שֶׁאִבַּדְתִּי

Money is then donated to support the poor in Israel.

Did I forget to mention that you also have to get up and look for the object? :)

Yours truly,

Rabbi Menachem Posner