If the Ark of the Covenant is anywhere it is in a cave on Mt. Nebo where it was placed by the prophet Jeremiah at the time of the Babylonian Exile.
6 Some of those who followed him came up to mark the way, but could not find it. 7 When Jeremiah learned of it, he rebuked them and declared: "The place shall be unknown until God gathers his people together again and shows his mercy.
TL DR: People have to know the way.
One interesting thing about the Hebrew title of the movie [Raiders of the Lost Ark] is that the word for the Ark is "teiva" [תיבה] -- as in Noah's Ark, or Moses' baby basket -- not "aron" [ארון] as in the Ark of the Covenant or Joseph's coffin:
שודדי התיבה האבודה
The Raiders' Wikipedia page uses both words throughout, with another word used for the Ark's storage crate (ארגז עץ wooden crate).
So, back to the "teiva" being the lost Ark as per the title...
A "teiva" is also a word meaning the [written] word, or a measure of music, or a box.
It's commonly used in the phrase "roshei teivot" [ראשי תיבות], which is an acronym/abbreviation/initialism, itself abbreviated as ר"ת. Literally, the heads of [written or printed] words.
(Perhaps the idea is that an acronym represents and contains the full measure/contents of a word or phrase.)
Thus, the movie title alternately could be read as Raiders of the Lost Word or Raiders of the Lost Box or Raiders of the Lost Bar [of music].
Well, like with a lot of things, ain't nobody got time fo' dat.
Ironic, because
A bar (or measure) is a fundamental unit of musical time, acting as a container for a specific number of beats defined by the time signature.
In non-Christian circles, historical times are marked by BCE and CE, versus BC and AD respectively. The turning point is the same, however.
"Before the Common Era" or "Common Era" allude to the measure of time known as common time -- the 4/4 or C standard time signature.
It's like windows, but who ever counts the panes?
"4 over 4":

The Lost Ark/Box/Measure/Word:
התיבה האבודה
= 445, a sum of word(s) which first appears in the Torah in Genesis 1:3...
ohr veyehi ohr:
*ויאמר אלהים יהי *אור ויהי אור
And God said, Let there be *light: and there was light*.
I simply follow the trailheads. Great views always. Not one in that image, but eight.
Some of those who followed him came up to mark the way, but could not find it.
No sense of humor, much less any interest in true adventure and its spirit of discovery. It's not any work at all if it is love.
Another term for an abbreviation is kitzur [קיצור], as in "for short". And a short cut is a short way, a kitzur derech [קיצור דרך].
More irony is that at the end of the movie, the Ark's crate is locked up and then marked "Top Secret", yet the "roshei teivot" on the box itself (US) "hides" the key:
Because there is only one way to perform this (which means there is only one possibility), the Atbash cipher provides no communications security, as it lacks any sort of key.
This is a Hebrew artifact, so the letters US are...
U: יו
S: אס
Atbash of = יואס --->
which is a key that provides no communications security.
A key is found in the *last* place it was left.
Such as over in Genesis 41:45, at a *skip of 4* on the last letters of Joseph's cipher code name, "shem Yosef Tzafnat Pa'aneach" [שֵׁם־יוֹסֵף צָפְנַת פַּעְנֵחַ], along with the ankh [ענח] in "Pa'aneach".
But hey, it's just a silly movie. Who ever thinks of looking in fiction for INTEL.
Amazing, the stuff that just sits there.
At least the average Joe on the street can say right off where the Ark is located. Experts, not so much.
Who truly wants to solve mysteries because where's the profit in that?
The beat goes on.