If so, I’d skip them and save yourself future hassle. 

If you want to pay for a skip trace but that is usually for lists, you can do some good old fashioned Google detective work as well.

When I find records like this, how would I know if they still owe without wasting my money and time skip tracing them and bothering the owner over an issue that may be resolved already?  

I don't think i'll be using the direct mail feature as often.I think the skip tracing feature is quiet expensive, so I don't see me using that feature.

I feel like I could easily skip over something that I should not have and it would come back to bite me.

For more write outs of deals (where the deal is written on a white board etc...) click the link, and skip over the first one by Grant Cardone (he is great, but he is doing massive 200 unit and up deals). https://www.youtube.com/results?

Every time I've been burned and had to end up dealing with a much bigger problem, bug/rodent issues affecting surrounding tenants, city notices, tenant skips town after giving their sob story of being behind on rent, etc...All that to say, if the lease is month-to-month, let the tenant know what has to happen or she has to go.

@Jay Hinrichs - Amen, skip credit repair.

Also can a 1031 exchange be used if we plan to use the house that is on the property as a Bed and Breakfast/Airbnb type rental?

The tool I recommend is called Beyond Pricing.Instant BookInstant book is a tool on Airbnb that allows you to skip the process of approving a guest and will automatically allow them to book your listing.