hi!
fortunately for us, my wife and i are now living in macau. we were able to cross the border to get the police certificate. the place we lived before was in a city in guangdong province. like you, we had an F visa as well.
let me share with you our experience.
documents we prepared:
1. old passport containing the visas
2. new passport
3. registration form of temporary residence for visitors outside the border - this is the form we filled up when we first arrived in china. we registered in the local police station
the process we went through:
1. went to the police station where we registered
2. presented our registration form and old passports
3. we were told to have our new passports translated
4. went to a translation centre
5. back at police station, we were told they cannot issue certificate for us because we stayed there in 2005 when they were not encoding records in the computer yet. since no record, cannot check if we do not have criminal record.
6. explained to them our situation - that we are applying for canadian immigration
7. they asked for proof when we arrived in china and when we left
8. we showed them the arrival and departure stamps in our passports
9. the guy went in and out of his boss' office
10.finally, he said he can issue us a certificate of no criminal record
(we were lucky because when we first inquired by phone, we were told that the certificate will be issued 3 working days after. but we got it same day. btw, we did ask if we can ask someone to do it for us or just one of us to go there. but they told us both of us should go to apply.)
took the certificate and went to the notary public office
1. presented all the documents - passport, passport copies, visa copies, passport translation copies, registration form copies
2. we were told the certificate (with translation) will be ready in 10 working days
3. got lucky again as certificate was ready in less 10 days
4. they asked for an original stamp (red) from the police station so went there to get it
5. paid the fees in the bank
6. went back to notary office to get get certificates
it was not as simple as it sounded. we spent a whole afternoon explaining to the police officer why we needed the certificate.