Search for them in free models. Just be aware that not all of them will work and some may have negative affects on your place such as purposely causing massive lag.
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Lua Scripts
You can't unless they are open for use in the toolbox.
Roblox hopperbin scripts are scripts that are placed in Roblox hopperbin objects. These scripts control tools such as balefire and fly tools. They are also used in group building tools such as the copy and delete tools.
You can get admin commands for Roblox on the free models. One popular admin commands script is Person229's admin commands. There are also numerous other VIP command scripts available on the free models which you can use.
i do not know, either get someone to make you one or check free models