Discovering Upper Court Judgements - general questions

[Jude Welsh]

Hi Everyone,

I'm planning to attend a Sheriff's sale in NJ in September, and have selected four candidate properties.  I've seen the properties and run title searches, and understand the open municipal obligations (tax, sewer etc), lien priority etc.

My friend who is a professional title researcher mentioned that in addition to the county clerk's data I should also be checking Upper Court Judgements.  

I subsequently found the NJ online Judgement search tool for "Statewide" judgment liens filed in NJ"

Question: so there could be judgements attaching to the property that are not recorded at the county clerk's as a lien?

At the Federal level I've seen liens recorded at the county level on properties, and could there be other Federal liens that aren't discoverable by either the county clerks or NJ judgement database - and how would I discover those?

cheers!