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To sell him a stolen cellphone or something like that.

Наверное, они искали какого-нибудь идиота.
They probably were looking for a/an/any idiot mentally challenged person.

Они искали какого-то...

To sell him a stolen cellphone or something like that.

Exactly. You kinda got the principle. The grammar is ok!
But in Russian if we don't want to specify something to someone we say "кое-каких".
This implies I know what exactly but it's not your...

Here's a copy-paste of my old post from another forum devoted to learning of the Russian language:

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ТО vs НИБУДЬ

At first, a little of theory.
Both...

"*-либо" is a formal version of "*-нибудь"
любой is also ok in this context.
Если вам потребуется любая (какая-нибудь) дополнительная информация касательно примеров девиантного поведения, вы можете...