¿Tendría un boli?
is the only one correct, but it crashes in style, why? because it uses a "condicional de cortesía", that is, it's a formal way to ask, therefore "boli" is a disastrous choice [I suppose "boli" to be a short for "bolígrafo"]
"Tenga un boli" means "have a pen", and again, formality and colloquialism clash.
The conjugations "tuveria" or "tuvería" don't exist.
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