How about constantly late payments?

Make sure to keep receipts/invoices of repairs or payments you have made to help with taxes. 

Put your popcorn away because for now I am exercising the Lincoln Leadership method. 

No matter what, if this is your first investment property deal, you will have to have some "skin in the game" with anywhere from a 10% to 25% down payment, plus closing costs and required reserves.

With this method you would have a total of 3 properties your (primary, accidental property, and new investment property).If you are interested in getting rid of the accidental property doing the 1031 exchange tax wise would be more beneficial to do than just selling the accidental home and not using the funds to purchase a home of equal or greater value.

Bought on contract/took over payments until financed with mortgage.

I think the other methods you mentioned can be just as if not more profitable as storage again depending on strategy, deal and execution.  

So, it would show up as "withdrawn", but even with that a withdrawn complaint could mean the tenant paid up and the landlord accepted payment.

It would be interesting if Section 8 payments for your area were higher than what you say is average for the same bedroom count for non-voucher holders. 

Offer to pay cash in a seller finance deal with no money down and 90 days before the first payment.