For example I had one property manager that told me she wouldn’t upcharge the repairs but ended up getting an invoice for double the amount.

I have them download various utility invoices, name the files the way I like and upload them to my cloud storage.

I work on maintenance requests (logging, scheduling, verifying work was done, and making sure invoices/work orders are in the system properly), tenant communications (late rent, lease violations, answering questions), tenant background checks, and responding to inquiries when a property is available for rent (just to name a few things).

If your PM knows where they moved to, have them send an itemized invoice and see if they pay it.

They bill it after the fact on an invoice  

Enter a maintenance request, assign a vendor, attach a fake invoice.

[She] wife receipts and invoices that substantiate the hours she logged."

A few weeks earlier got a TEXAS SALES AND USE TAX PERMIT come in mail.Not sure what it is .Now i got invoice from comptrollers office saying the LLC owes 1000,s of $$ in Back taxes .Cant figure out what on earth is happening .

That is a great idea to apply it to unpaid invoices.

On your initial inspection, document every room, and inside every cabinet and major appliance with photos, make your list of Tenant damages and get them handled/invoiced within the required timeline per local law.