tampered

The title says it all... i gave theitwares.com 63500 for a MSI Sea Hawk and he sent me a marble instead. This video has pictures and the details- Cheated by theitwares.com - How I paid Rs 63500 for a piece of marble - YouTub Now, he has washed his hands of me and is also ignoring my...

Here's a question. I would assume all of us at some point have considered getting a mobile from ebay. How would you know if the phone had been tampered with ? I mean for instance if the phone was aquired illegitamatley and had the Imei tampered with, how would you know ? Also as importantly how...