What about General Licensed Contractor who  gave us invoice for work and we paid for invoice? 

Are all docs and invoices available online? 

@Michael Dang - here is a free resource to check if your property is in a flood zone.  

The safe harbor applies to amounts paid during the tax year to acquire or produce what the regs call a “unit of property” (UOP), you must meet these requirements: (1) at the beginning of the tax year, the taxpayer has written accounting procedures treating as an expense for non-tax purposes amounts paid for property costing less than a specified dollar amount (which will be 2500 for you), or with an economic useful life of 12 months or less;.(2) the taxpayer treats the amount paid for the property as an expense on its books and records in accordance with its accounting procedures. ( do this on your bookkeeping software or whatever you utilize)(3) the amount paid for the UOP doesn't exceed $2,500. as substantiated by invoice.Note: The cost for the Unit of Property includes additional costs (for example, delivery fees, installation services, or similar costs) if these additional costs are included on the same invoice with the tangible property.Eg:A purchases 100 printers at $500 each for a total cost of $500,000 as indicated by the invoice.

Invoice for damages as you discover them.

Air bnb was unwilling to compensate me for damages even though I had photo proof of all the rules being broken because I didn't have an "acceptable" invoice for the clean up. 

The owner is invoicing me for the property taxes and wants me to pay him by mid december (tax bill is due by the end of january 2018).

.; you get the picture.I later learned when they moved they went on to purchase their own home and danged if they didn't advertise for room renters (and pets were allowed). 

Then, despite my having a quote, our acceptance, pictures he posted of the job in progress, an invoice upon completion of work and proof of payment, he denied we ever did business with us!

If they give it the thumbs up in writing on the invoice, not your problem.