Some people will sell it for quick cash then reported it lost so that they can get another one by just paying the insurance deductible. I think it's only $175 or something like that. It happened to me before with a phone I bought off someone.
Still though, a month later? I mean I get what you're saying, but dang.
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I've done several phone deals on Criagslist and I've never had this happen to me. Although I screen my potential CL deals very thoroughly.
Lesson learnt don't buy on Craiglist