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As an Apple-certified technician, I can tell you they can pop your serial number into a web interface and pull up warranty info on your system (I could as well), receipt or no receipt.

I bought an iphone from apple store but I lost my receipt. Is there a way I can get a new copy of the receipt either by calling them or visiting them?? And what do I need to provide in order for them to retreive the receipt? e.g. IMEI or serial number..?
 
I bought an iphone from apple store but I lost my receipt. Is there a way I can get a new copy of the receipt either by calling them or visiting them?? And what do I need to provide in order for them to retreive the receipt? e.g. IMEI or serial number..?

I'm not sure, I don't have access to the retail side. I only have access available to repair info.
 
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