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Again I have come to a place I just was.

Enter it, I have, just because.

I bought a shovel, that I wish to give back,

Because I’m not allowed to bury Uncle Jack.

I was given a key, it was not for a door,

Not a what am I, but a what is it, be sure.

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    $\begingroup$ Is it linked with computer accessories/ peripherals such as key-boards ? $\endgroup$ – Mea Culpa Nay Sep 4 '17 at 12:38
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It could be

Zipcode

As

Again I have come to a place I just was

Posts with return stamps attached (usually not a case though!) come back to place where they belong to!

Enter it, I have, just because

without which post could not be delivered (in time, sometimes)

I bought a shovel, that I wish to give back,

To be explored ...

Because I’m not allowed to bury Uncle Jack.

To be explored ...

I was given a key, it was not for a door,

The key (code) is for a place/home and not for a door (not a physical one!)

Not a what am I, but a what is it, be sure.

A zipcode by itself is useless, if it is not having proper value (5 or 9 digits)

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    $\begingroup$ Random suggestions off the top of my head: "I bought a shovel, that I wish to give back" -> a shovel that has to be returned due to incorrect shipping; "Because I’m not allowed to bury Uncle Jack" -> you cannot send ("bury" into a package) people through the mail system. $\endgroup$ – You Sep 4 '17 at 17:18
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Is it:

SSH (Secure SHell)?

Again I have come to a place I just was.

A typical use of SSH is to access a (probably headless) computer that you own, where you "just were" setting up.

Enter it, I have, just because.

Entering the computer via SSH.

I bought a shovel, that I wish to give back,

This might be tools like Metasploitable (the shovel), which are used to test / exploit systems, which you wish to give back because... (see next clue)

Because I’m not allowed to bury Uncle Jack.

Might refer to not being able to attack (bury) an SSH server (Uncle Jack) by law / because the program is so well protected.

I was given a key, it was not for a door,

A key in cryptography is a special value that is used to encrypt and unencrypt data. The key in reference is the SSH public key, which is used to SSH into a computer without entering a password or passphrase.

Not a what am I, but a what is it, be sure.

SSH is merely a protocol, and as such, it is up to individual programs (such as OpenSSH) to establish how it actually executes.

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