Need broker to sell .com domain to a specific Chinese company. Buyer is identified.

[HiFiNames.com]

Hi Peers,

I have a 5 letter .com domain.

A Chinese person / company has registered all other major extensions like
net
org
biz
info
tv
co
mobi
asia
cn
com.cn
org.cn

They hold these extensions for past 3 years but with no website.

I sent a mail to the whois of the domains and no response. ( I don't know chinese )

Should I appoint a chinese domain broker or how to proceed?