Lui Bo and four others associated with publisher Mighty Current, which produced books critical of Chinese leaders, went missing last year.
Mr Lui, the general manager of Mighty Current, disappeared on 15 October while in Shenzhen in southern China.
All five men later surfaced in custody of Chinese police.
The men appeared on Chinese television on Sunday, with four of them, including Lui Bo, saying they had been detained for "illegal book trading".
Public confessions have long been a part of China's criminal law although experts say many confessions are forced.
Hong Kong police said in a statement that they met Lui Bo on Friday.
Mr Lui told Hong Kong police he did not need any assistance from them or the Hong Kong government, and asked police to cancel the missing persons case related to him, they said.
"He refused to disclose other details," the statement added.
Pro-democracy lawmaker Albert Ho told AFP he believed Mr Lui "must be very scared", and that his request that police drop his case was "just to show the mainland authorities that he will keep quiet".
Hong Kong's missing booksellers and 'banned' Xi Jinping book
Causeway Bay Books, the Hong Kong shop owned by Mighty Current, closed following the disappearances.
The case has sparked accusations of China violating Hong Kong's judicial independence.
Two of the men, Gui Minhai and Lee Bo, were outside mainland China when they disappeared. Mr Gui was in Thailand and Mr Lee in Hong Kong - where Chinese police do not have jurisdiction.
Mr Lui's two other colleagues, Cheung Chi Ping and Lam Wing Kee, are also expected to be released on bail in coming days.
Mr Lui's release comes just a day before the opening of China's annual parliamentary session, the National People's Congress, in Beijing.
The UK has previously expressed concern about the disappearances. It said last month that Mr Lee, who has a British passport, was probably "involuntarily removed" to China in what would have been a "serious breach" of the Hong Kong handover treaty.
However, China's foreign ministry has said its officials would not behave illegally, and urged other countries not to meddle in its affairs.
Mr Lee was shown on Chinese state TV on Monday, denying he had been abducted by Chinese officials, and saying he would renounce his British citizenship.
However, his supporters believe the interview was done under duress.
http://www.bbc.com/news/world-asia-china-35729143
Structure of the Lead：
WHO-Hong Kong bookseller
WHEN-15 October
WHAT-missing
WHY-taken by China
WHERE-Hong Kong
HOW-illegally
Keywords：
1. detained：被拘留
2. disclose：透漏
3. accusations：指責
4. Pro-democracy ：民運
5. judicial ：司法
6. jurisdiction：管轄權
7. parliamentary ：會議
8. involuntarily：不由自主地
9. abducted：綁架
10. duress：脅迫
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