Well, about birth certificates - they write a disclaimer on them in indelible ink. I was adopted, so I know what they did when I went to get a copy of my birth certificate.
As a chemist, I know I could get around that and pass off the funny appearance as "something got spilled on it" - 99% acceptance rate, and only household chemicals needed.
Delivered goods - a work colleague of my wife got her card details stolen somehow. The fraudster was sitting in his car outside her house when she was working to take delivery of a couple of top-line laptops and some peripherals.
Someone cloned my debit card in Paris (I never use it abroad, but I use it on ferries) and tried to extract £6k on it. I was right up to the limit on my overdraft, so it was only good for £110 anyway.
A credit card was lost in the post - it was probably delivered to 26 xxxxx street, when I lived at 26 Upper xxxxx street, and I know the inhabitants of 26 xxxxx street are a pack of rascals anyway. That card was used to buy petrol from so many local filling stations I wouldn't have believed that the "Jat mafia" could extend so far. I was in Glasgow that day, and I calculated that I could have gone to Glasgow and back TWICE using the "petrol" bought.
I know that a lot of fraudsters will look for a "house for sale" with an open porch, where they can get goods delivered. Look like they're gardening, and why should the delivery man ask?
As an ex-delivery man, I can honestly say I've delivered to a couple of "knights of the realm" who were gardening at the time of delivery, as well as lots of ordinary people. After a while, you get cautious about the "for sale" sign and ask for ID - just like you learn to be wary when there's a notice on the delivery door bell, asking you to ring a mobile number because the bell's not working.
Getting the goods is relatively "simples"!, unless I'm the bloke delivering - and I'd be the first to admit it is easy to deceive a delivery man.