My H1B stamp on my passport is still valid although I already moved back to my home country. Question is: can I use H1B visa for coming back to the country for closing my bank account and selling my car? It's been 3 months since I quit my US job and traveled back to my country.
You cannot use your H-1B visa for that purpose. Instead you should travel to the US as a visitor (using a B-2 visa or the Visa Waiver Program [ESTA]). Probably, the employer has already cancelled the H-1B visa. One possible outcome of using the H-1B visa is that you could be subject to "Expedited Removal" and barred from the US for five years. Even worse, if the immigration inspectors believe you have told them a lie (that you are still working for the H-1B employer) you could be barred from the US forever.
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Your H1B is solely for you to work in the US for the qualified employer. You should return on a visitor visa or visa waiver, depending on your country of nationality.
Under the guidelines set by AVVO, this response is general information only and not specific legal advice, and no attorney client relationship is formed by this response to your question.