I am a buy and holder so I can't help with any information on flipping. 

When a sect8 voucher holder wants to rent the unit and has a voucher for $2400, can the LL tell housing that the rent is now $2400?

They don't need to impress stock holders, clients, or anyone else so they can purchase the more modest items instead.Makes sense when I think about it now but I never even considered that before.

The broker/agent is NOT required to submit offers to the note holder.The broker/agent is only required to submit to the seller.The broker/agent can then advise the seller of whether the offer has merit and is worth submit to the bank for a chance at an approval.Brokers/agents doing short sales for awhile know what numbers banks are wanting to hit.If the offer or terms are so off the mark then the broker/agent will advise the seller to counter back the offer at terms the senior note holder will likely accept.For REO brokers the banks are repeat clients.For unproven investors you are trying to get a one off transaction at an ultra low price to start your investing career and build cash.So the REO brokers care about the banks their cleints much more than you "getting a steal".

Now how can I get the information on lein holders?

Just because you may be exempt doesn't mean it's the Wild West and you can do anything you like, your activities will still be viewed as to what is deemed prudent and what is prudent is compliance with the laws as they may be applicable.For example, there is no reason that an individual note holder can not comply in giving notices required within the time frames such are required, it's not an impossibility to comply with that aspect and you won't be able say "kings X, the law doesn't apply to me" in every aspect.  

I'm still wondering what happens when/should the holder of the Note passes away. 

There is a $2000 lien holder they did not give notice to in the foreclosure, I guess I will have to settle if this goes through.Like I said in a earlier post, I don't see any greater risk in this than buying at a trustee sale.

My understanding is that this is the case with the Free and Clear Tax sales - as long as other lien-holders are properly notified, the lien is wiped out.

Once you have the certificate, you can then contact the agent if it looks funny in any way.As a certificate holder, changes to the policy should be sent to you - that would include failure to pay and notice of cancellation.I never accept a certificate handed to me by a contractor, since that can be out of date and does not give me any "rights" since I won't be named specifically on such a certificate.