Buying an iPhone 4 off gumtree?

Basically, I'm buying an iphone 4 off gumtree and I want to make sure I'm not getting scammed and the best ways to avoid this?

My idea is to meet up at the apple get them to check it over and stuff,
-check the imei & serial number which he has given to me
-check for water damage and whatnot

then get the seller to sign some paper saying they legally hand over the phone to me, so they can't just say its been stolen, get it blocked and cash in with insurance companies.

any other ideas that could help me?
it is a pretty reasonable price so yeah.

You just take the risk, usually a cheap price = there's something wrong as it is easy to get the new RRP for a second hand phone.

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