With the information you've given so far I would say send letters to every address you have.If it's a bank or mortgage servicing company and it's a large one, don't waste money on stamps.If it's a local bank, like HI only, go to a branch and ask for the REO dept.Good luck!

If you have no intention on listing the house instead of wasting an agents time with a fake listing appointment you could hire a realtor to do a BPO (Broker Price Opinion) which should only cost about $50 and should provide you with enough information to see if the appraiser was way off.

The person going with me had to change plans and I would hate for it to go to waste. 

Sacrifice two years of my life to potentially make $30k/month, or having fun working a minimal schedule and collecting pennies while I'm building up my net worth?  

Obviously discounting commission on a low priced property ($100,000 for example) isn't worthwhile for some agents because the return is minimal, but would you consider discounting your commission on a property priced around $500,000 or even a $1,000,000 knowing that you'd potentially be netting around $12,500 before other expenses (and let's say the commission was discounted from 3% to 2.5%)?

Minimal crime?

Or is it better to use the lower value from the appraisal and minimize audit risk.  

You do usually pay a higher interest rate but unless the difference in payment is minimal it gives you more flexibility.

I don't want to waste my time sending you a home you won't or can't buy.  

Here's some evidence of Trump's so called success and why real estate seminars are a waste of your time."